Terminal device, base station device, communication method, and integrated circuit

ABSTRACT

Aspects of the disclosure relate to a terminal device including a transmission unit configured to transmit a HARQ-ACK using a first PUCCH resource and a PUCCH format ( 3 ) with respect to PDSCH transmission on a secondary cell having a cell index less than or equal to a first predetermined value, and transmit a HARQ-ACK by using a second PUCCH resource and a PUCCH format ( 4 ) with respect to PDSCH transmission on a secondary cell having a cell index greater than the first predetermined value. The first predetermined value may be the value of a fourth cell index when arranging the values of the cell indices set by a base station device in ascending order.

This application claims priority based on JP 2015-090911 filed on Apr.28, 2015, the contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a terminal device, a base stationdevice, a communication method, and an integrated circuit.

BACKGROUND ART

In the 3rd Generation Partnership Project (3GPP), a radio access methodand a radio network for cellular mobile communications (hereinafterreferred to as “Long Term Evolution (LTE)”, or “Evolved UniversalTerrestrial Radio Access (EUTRA)”) have been considered (NPL 1, NPL 2,NPL 3, NPL 4, and NPL 5). In LTE, a base station device is also referredto as an evolved NodeB (eNodeB), and a terminal device is also referredto as user equipment (UE). LTE is a cellular communication system inwhich an area is divided into a plurality of cells to form a cellularpattern, each of the cells being served by a base station device. Insuch a cellular communication system, a single base station device maymanage multiple cells.

LTE supports a time division duplex (TDD). LTE that employs a TDD schemeis also referred to as TD-LTE or LTE TDD. In TDD, uplink signals anddownlink signals are time division multiplexed. Furthermore, LTEsupports a frequency division duplex (FDD).

In 3GPP, career aggregation has been specified which allows a terminaldevice to perform simultaneous transmission and/or reception in up tofive serving cells (component careers).

In addition, in 3GPP, a configuration where a terminal device performssimultaneous transmission and/or reception in more than five servingcells (component careers) has been considered (NPL 1). Furthermore, aconfiguration where a terminal device transmits a physical uplinkcontrol channel on a secondary cell which is a serving cell other thanthe primary cell has been considered (NPL 6).

CITATION LIST Non Patent Literature

NPL 1: “3GPP TS 36.211 V12.4.0 (December 2014) Evolved UniversalTerrestrial Radio Access (E-UTRA); Physical channels and modulation(Release 12)”, 6 Jan. 2015.

NPL 2: “3GPP TS 36.212 V12.3.0 (December 2014) Evolved UniversalTerrestrial Radio Access (E-UTRA); Multiplexing and channel coding(Release 12)”, 6 Jan. 2015.

NPL 3: “3GPP TS 36.213 V12.4.0 (December 2014) Evolved UniversalTerrestrial Radio Access (E-UTRA); Physical layer procedures (Release12)”, 7 Jan. 2015.

NPL 4: “3GPP TS 36.321 V12.4.0 (December 2014) Evolved UniversalTerrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocolspecification (Release 12)”, 5 Jan. 2015.

NPL 5: “3GPP TS 36.331 V12.4.1 (December 2014) Evolved UniversalTerrestrial Radio Access (E-UTRA); Radio Resource Control (RRC);Protocol specification (Release 12)”, 7 Jan. 2015.

NPL 6: “New WI proposal: LTE Carrier Aggregation Enhancement Beyond 5Carriers”, RP-142286, Nokia Corporation, NTT DoCoMo Inc., NokiaNetworks, 3GPP TSG RAN Meeting #66, Hawaii, United States of America,8-11 Dec. 2014.

SUMMARY OF INVENTION Technical Problem

However, for the radio communication system as described above, aconcrete method when transmitting uplink control information has notbeen sufficiently discussed.

The present invention has been made in light of the foregoing, and anobject of the present invention is to provide a terminal device, a basestation device, a communication method, and an integrated circuit whichenable efficient transmission of uplink control information.

Solution to Problem

(1) In order to accomplish the above-described object, some aspects ofthe present invention are contrived to provide the following means.Aspects of the present invention relate to a terminal device including atransmission unit configured to transmit, with respect to PDSCHtransmission on a secondary cell having a cell index less than or equalto a first predetermined value, a HARQ-ACK using a first PUCCH resourceand a PUCCH format 3, and transmit, with respect to PDSCH transmissionon a secondary cell on a secondary cell having a cell index greater thanthe first predetermined value, a HARQ-ACK using a second PUCCH resourceand a PUCCH format 4. The first predetermined value may include a valueof a fourth cell index when values of a set of cell indices set by abase station device are arranged in ascending order. The first PUCCHresource for transmission of the HARQ-ACK using the PUCCH format 3 maybe designated based on at least a value set in an information fieldincluded in a downlink assignment for a secondary cell having a cellindex less than or equal to the first predetermined value. The secondPUCCH resource for transmission of the HARQ-ACK using the PUCCH format 4may be designated based on at least a value set in an information fieldincluded in a downlink assignment for a secondary cell having a cellindex greater than the first predetermined value.

(2) Aspects of the present invention relate to a terminal deviceincluding a transmission unit configured to transmit, with respect toPDSCH transmission on a secondary cell having a cell index less than orequal to a first predetermined value, a HARQ-ACK using a first PUCCHresource and a PUCCH format 3, and transmit, with respect to PDSCHtransmission on a secondary cell having a cell index greater than thefirst predetermined value, a HARQ-ACK using a second PUCCH resource anda PUCCH format 4. The first predetermined value may be a maximum cellindex value with a bit sequence of 10 or less obtained by sequentiallyconcatenating HARQ-ACK bits corresponding to the primary cell up toHARQ-ACK bits corresponding to a serving cell with a cell index for thefirst predetermined value. The first PUCCH resource for transmission ofthe HARQ-ACK using the PUCCH format 3 may be designated based on atleast a value set in an information field included in a downlinkassignment for a secondary cell having a cell index less than or equalto the first predetermined value. The second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

(3) Aspects of the present invention relate to a base station deviceincluding a reception unit configured to receive, with respect to PDSCHtransmission on a secondary cell having a cell index less than or equalto a first predetermined value, a HARQ-ACK using a first PUCCH resourceand a PUCCH format 3, and receive, with respect to PDSCH transmission ona secondary cell having a cell index greater than the firstpredetermined value, a HARQ-ACK using a second PUCCH resource and aPUCCH format 4. The first predetermined value may be a value of a fourthcell index when values of a set of cell indices set for a terminaldevice are arranged in ascending order. The first PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 3 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index less thanor equal to the first predetermined value. The second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

(4) Aspects of the present invention relate to a base station deviceincluding a reception unit configured to receive, with respect to PDSCHtransmission on a secondary cell on a secondary cell having a cell indexless than or equal to a first predetermined value, a HARQ-ACK using afirst PUCCH resource and a PUCCH format 3, and receive, with respect toPDSCH transmission on a secondary cell on a secondary cell having a cellindex greater than the first predetermined value, a HARQ-ACK using asecond PUCCH resource and a PUCCH format 4. The first predeterminedvalue may be a maximum cell index value with a bit sequence of 10 orless obtained by sequentially concatenating HARQ-ACK bits correspondingto the primary cell up to HARQ-ACK bits corresponding to a serving cellwith a cell index for the first predetermined value. The first PUCCHresource for transmission of the HARQ-ACK using the PUCCH format 3 maybe designated based on at least a value set in an information fieldincluded in a downlink assignment for a secondary cell having a cellindex less than or equal to the first predetermined value. The secondPUCCH resource for transmission of the HARQ-ACK using the PUCCH format 4may be designated based on at least a value set in an information fieldincluded in a downlink assignment for a secondary cell having a cellindex greater than the first predetermined value.

(5) Aspects of the present invention relate to a communication methodfor a terminal device. Aspects of the method may include transmitting,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andtransmitting, with respect to PDSCH transmission on a secondary cell ona secondary cell having a cell index greater than the firstpredetermined value, a HARQ-ACK using a second PUCCH resource and aPUCCH format 4. The first predetermined value may be a value of a fourthcell index when values of a set of cell indices set by a base stationdevice are arranged in ascending order. The first PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 3 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index less thanor equal to the first predetermined value. The second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

(6) Aspects of the present invention relate to a communication methodfor a terminal device. Aspects of the method may include transmitting,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andtransmitting, with respect to PDSCH transmission on a secondary cell ona secondary cell having a cell index greater than the firstpredetermined value, a HARQ-ACK using a second PUCCH resource and aPUCCH format 4. The first predetermined value may be a maximum cellindex value with a bit sequence of 10 or less obtained by sequentiallyconcatenating HARQ-ACK bits corresponding to the primary cell up toHARQ-ACK bits corresponding to a serving cell with a cell index for thefirst predetermined value. The first PUCCH resource for transmission ofthe HARQ-ACK using the PUCCH format 3 may be designated based on atleast a value set in an information field included in a downlinkassignment for a secondary cell having a cell index less than or equalto the first predetermined value. The second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

(7) Aspects of the present invention relate to a communication methodfor a base station device. Aspects of the method may include receiving,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andreceiving, with respect to PDSCH transmission on a secondary cell on asecondary cell having a cell index greater than the first predeterminedvalue, a HARQ-ACK using a second PUCCH resource and a PUCCH format 4.The first predetermined value may be a value of a fourth cell index whenvalues of a set of cell indices set for a terminal device are arrangedin ascending order. The first PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 3 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index less than or equal to the firstpredetermined value. The second PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 4 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index greater than the firstpredetermined value.

(8) Aspects of the present invention relate to a communication methodfor a base station device. Aspects of the method may include receiving,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andreceiving, with respect to PDSCH transmission on a secondary cell on asecondary cell having a cell index greater than the first predeterminedvalue, a HARQ-ACK using a second PUCCH resource and a PUCCH format 4.The first predetermined value may be a maximum cell index value with abit sequence of 10 or less obtained by sequentially concatenatingHARQ-ACK bits corresponding to the primary cell up to HARQ-ACK bitscorresponding to a serving cell with a cell index for the firstpredetermined value. The first PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 3 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index less than or equal to the firstpredetermined value. The second PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 4 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index greater than the firstpredetermined value.

(9) Aspects of the present invention relate to an integrated circuitmounted in a terminal device. The integrated circuit may cause theterminal device to perform a set of functions including transmitting,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andtransmitting, with respect to PDSCH transmission on a secondary cell ona secondary cell having a cell index greater than the firstpredetermined value, a HARQ-ACK using a second PUCCH resource and aPUCCH format 4. The first predetermined value may be a value of a fourthcell index when values of a set of cell indices set by a base stationdevice are arranged in ascending order. The first PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 3 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index less thanor equal to the first predetermined value. The second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

(10) Aspects of the present invention relate to an integrated circuitmounted in a terminal device. The integrated circuit may cause theterminal device to perform a set of functions including transmitting,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andtransmitting, with respect to PDSCH transmission on a secondary cell ona secondary cell having a cell index greater than the firstpredetermined value, a HARQ-ACK using a second PUCCH resource and aPUCCH format 4. The first predetermined value may be a maximum cellindex value with a bit sequence of 10 or less obtained by sequentiallyconcatenating HARQ-ACK bits corresponding to the primary cell up toHARQ-ACK bits corresponding to a serving cell with a cell index for thefirst predetermined value. The first PUCCH resource for transmission ofthe HARQ-ACK using the PUCCH format 3 may be designated based on atleast a value set in an information field included in a downlinkassignment for a secondary cell having a cell index less than or equalto the first predetermined value. The second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

(11) Aspects of the present invention relate to an integrated circuitmounted in a base station device. The integrated circuit may cause thebase station device to perform a set of functions including receiving,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andreceiving, with respect to PDSCH transmission on a secondary cell on asecondary cell having a cell index greater than the first predeterminedvalue, a HARQ-ACK using a second PUCCH resource and a PUCCH format 4.The first predetermined value may be a value of a fourth cell index whenvalues of a set of cell indices set for a terminal device are arrangedin ascending order. The first PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 3 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index less than or equal to the firstpredetermined value. The second PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 4 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index greater than the firstpredetermined value.

(12) Aspects of the present invention relate an integrated circuitmounted in a base station device. The integrated circuit may cause thebase station device to perform a set of functions including receiving,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andreceiving, with respect to PDSCH transmission on a secondary cell on asecondary cell having a cell index greater than the first predeterminedvalue, a HARQ-ACK using a second PUCCH resource and a PUCCH format 4.The first predetermined value may be a maximum cell index value with abit sequence of 10 or less obtained by sequentially concatenatingHARQ-ACK bits corresponding to the primary cell up to HARQ-ACK bitscorresponding to a serving cell with a cell index for the firstpredetermined value. The first PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 3 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index less than or equal to the firstpredetermined value. The second PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 4 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index greater than the firstpredetermined value.

Advantageous Effects of Invention

According to various aspects of the present invention, uplink controlinformation can be transmitted efficiently.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a concept of a radio communicationsystem according to the present embodiment.

FIG. 2 is a diagram illustrating a configuration of a slot according tothe present embodiment.

FIGS. 3A to 3C are diagrams illustrating PUCCH cell groups according tothe present embodiment.

FIG. 4 is a diagram illustrating a method to transmit uplink controlinformation according to the present embodiment.

FIG. 5 is a diagram illustrating a predetermined value according to thepresent embodiment.

FIG. 6 is a diagram illustrating a method to process uplink controlinformation according to the present embodiment.

FIG. 7 is a diagram illustrating a method to process uplink controlinformation according to the present embodiment.

FIG. 8 is a diagram illustrating a method to process uplink controlinformation according to the present embodiment.

FIG. 9 is a diagram illustrating a method for allocating PUCCH resourcesaccording to the present embodiment.

FIG. 10 is a schematic block diagram illustrating a configuration of aterminal device 1 according to the present embodiment.

FIG. 11 is a schematic block diagram illustrating a configuration of abase station device 3 according to the present embodiment.

DESCRIPTION OF EMBODIMENTS

Embodiments of the present invention will be described below.

FIG. 1 is a conceptual diagram of a radio communication system accordingto the present embodiment. In FIG. 1, the radio communication systemincludes terminal devices lA to 1C and a base station device 3.Hereinafter, the terminal devices lA to 1C are each also referred to asa terminal device 1.

Physical channels and physical signals according to the presentembodiment will be described.

With respect to FIG. 1, the following uplink physical channels are usedfor uplink radio communication from the terminal device 1 to the basestation device 3. Here, the uplink physical channels are used totransmit information output from the higher layers.

-   -   Physical uplink control channel (PUCCH)    -   Physical uplink shared channel (PUSCH)    -   Physical random access channel (PRACH)

The PUCCH is used to transmit uplink control information (UCI). Here,the uplink control information may include channel state information(CSI) used to indicate a downlink channel state. The uplink controlinformation may include scheduling request (SR) used to request anUL-SCH resource. The uplink control information may include hybridautomatic repeat request acknowledgment (HARQ-ACK). HARQ-ACK mayindicate HARQ-ACK for downlink data (transport block, medium accesscontrol protocol data unit (MAC PDU), downlink-shared channel (DL-SCH),or physical downlink shared channel (PDSCH)).

In other words, HARQ-ACK may indicate acknowledgment (ACK) ornegative-acknowledgment (NACK). Here, HARQ-ACK may also be referred toas ACK/NACK, HARQ feedback, HARQ acknowledgment, HARQ information, orHARQ control information.

The PUSCH is used to transmit uplink data (uplink-shared channel(UL-SCH)).

Furthermore, the PUSCH may be used to transmit HARQ-ACK and/or CSI alongwith the uplink data. Furthermore, the PUSCH may be used to transmit CSIonly or HARQ-ACK and CSI only. In other words, the PUSCH may be used totransmit the uplink control information only.

Here, the base station device 3 and the terminal device 1 exchange(transmit and receive) signals with each other in the higher layers. Forexample, the base station device 3 and the terminal device 1 maytransmit and receive radio resource control (RRC) signaling (alsoreferred to as RRC message or RRC information) in the RRC layer,respectively. The base station device 3 and the terminal device 1 maytransmit and receive a medium access control (MAC) element in the MAClayer, respectively. Here, the RRC signaling and/or the MAC controlelement is also referred to as higher layer signaling.

The PUSCH may be used to transmit the RRC signaling and the MAC controlelement. Here, the RRC signaling transmitted from the base stationdevice 3 may be signaling common to multiple terminal devices 1 in acell. The RRC signaling transmitted from the base station device 3 maybe signaling dedicated to a certain terminal device 1 (also referred toas dedicated signaling). In other words, user-equipment-specificinformation (information unique to user equipment) may be transmittedthrough signaling dedicated to the certain terminal device 1.

The PRACH is used to transmit a random access preamble. The PRACH may beused for an initial connection establishment procedure, a handoverprocedure, a connection re-establishment procedure, uplink transmissionsynchronization (timing adjustment), and designating a PUCCH resourcerequest.

In FIG. 1, the following uplink physical signal is used in the uplinkradio communication. Here, the uplink physical signal is not used totransmit information output from the higher layers but is used by thephysical layer.

-   -   Uplink reference signal (UL RS)

According to the present embodiment, the following two types of uplinkreference signals are used.

-   -   Demodulation reference signal (DMRS)    -   Sounding reference signal (SRS)

The DMRS is associated with transmission of the PUSCH or the PUCCH. TheDMRS is time-multiplexed with the PUSCH or the PUCCH. The base stationdevice 3 uses the DMRS in order to perform channel compensation of thePUSCH or the PUCCH. Transmission of both of the PUSCH and the DMRS ishereinafter referred to simply as transmission of the PUSCH.Transmission of both of the PUCCH and the DMRS is hereinafter referredto simply as transmission of the PUCCH.

The SRS is not associated with the transmission of the PUSCH or thePUCCH. The base station device 3 uses the SRS in order to measure anuplink channel state.

In FIG. 1, the following downlink physical channels are used fordownlink radio communication from the base station device 3 to theterminal device 1. Here, the downlink physical channels are used totransmit the information output from the higher layers.

-   -   Physical broadcast channel (PBCH)    -   Physical control format indicator channel (PCFICH)    -   Physical hybrid automatic repeat request indicator channel        (PHICH)    -   Physical downlink control channel (PDCCH)    -   Enhanced physical downlink control channel (EPDCCH)    -   Physical downlink shared channel (PDSCH)    -   Physical multicast channel (PMCH)

The PBCH is used to broadcast a master information block (MIB), or abroadcast channel (BCH), that is shared by the terminal devices 1.

The PCFICH is used to transmit information designating a region (OFDMsymbols) to be used for transmission of the PDCCH.

The PHICH is used to transmit a HARQ indicator (HARQ feedback oracknowledgment information) designating acknowledgment (ACK) or negativeacknowledgment (NACK) with respect to the uplink data (uplink sharedchannel (UL-SCH)) received by the base station device 3.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). Here, multiple DCI formats are defined fortransmission of the downlink control information. In other words, afield for the downlink control information is defined in a DCI formatand is mapped to information bits.

For example, DCI formats for downlink (e.g., DCI format 1A and DCIformat 1C) to be used for the scheduling of one PDSCH in one cell(transmission of a single downlink transport block) may be defined.

Here, each of the downlink DCI formats includes information on thescheduling of the PDSCH. For example, the downlink DCI format includesdownlink control information such as a carrier indicator field (CIF),information on resource block assignment, or information on a modulationand coding scheme (MCS). Here, the downlink DCI format is also referredto as downlink grant or downlink assignment.

Furthermore, for example, DCI formats for uplink (e.g., DCI format 0 andDCI format 4) to be used for the scheduling of one PUSCH in one cell(transmission of a single uplink transport block) are defined.

Here, each of the uplink DCI formats includes information on thescheduling of the PUSCH. For example, the uplink DCI format includesdownlink control information such as a carrier indicator field (CIF),information on resource block assignment and/or hopping resourceallocation, information on modulation and coding scheme (MCS) and/orredundancy version, or information used for designating the number oftransmission layers (precoding information and the number of layers).Here, the uplink DCI format is also referred to as uplink grant oruplink assignment.

In a case where a PDSCH resource is scheduled in accordance with thedownlink assignment, the terminal device 1 may receive downlink data onthe scheduled PDSCH. In a case where a PUSCH resource is scheduled inaccordance with the uplink grant, the terminal device 1 may transmituplink data and/or uplink control information on the scheduled PUSCH.

Here, the terminal device 1 may monitor a set of PDCCH candidates and/orEPDCCH candidates. The PDCCH may indicate a PDCCH and/or an EPDDCHbelow. Here, the PDCCH candidates are candidates which the PDCCH may bemapped to and/or transmitted on by the base station device 3.Furthermore “monitor” may imply that the terminal device 1 attempts todecode each PDCCH in the set of PDCCH candidates in accordance with eachof all the monitored DCI formats.

The set of PDCCH candidates to be monitored by the terminal device 1 isalso referred to as a search space. The search space may include acommon search space (CSS). For example, the CSS may be defined as aspace common to multiple terminal devices 1. The search space mayinclude a UE-specific search space (USS). For example, the USS may bedefined at least on the basis of a C-RNTI assigned to the terminaldevice 1. The terminal device 1 may monitor PDCCHs in CSS/or USS todetect a PDCCH destined for the terminal device 1 itself.

Here, an RNTI assigned to the terminal device 1 by the base stationdevice 3 is used for the transmission of downlink control information(transmission on the PDCCH). Specifically, cyclic redundancy check (CRC)parity bits are attached to a DCI format (or downlink controlinformation), and after the attachment, the CRC parity bits arescrambled with the RNTI. Here, the CRC parity bits attached to the DCIformat may be obtained from the payload of the DCI format.

The terminal device 1 attempts to decode the DCI format to which the CRCparity bits scrambled with the RNTI have been attached, and detects, asa DCI format destined for the terminal device 1 itself, the DCI formatfor which the CRC has been successful (also referred to as blindcoding). In other words, the terminal device 1 may detect the PDCCH withCRC scrambled with the RNTI. The terminal device 1 may detect the PDCCHincluding the DCI format to which the CRC parity bits scrambled with theRNTI have been attached.

Here, the RNTI may include a cell-radio network temporary identifier(C-RNTI). The C-RNTI is an identifier unique to the terminal device 1and used for the identification in RRC connection and scheduling. TheC-RNTI may be used for dynamically scheduled unicast transmission.

The RNTI may further include a semi-persistent scheduling C-RNTI (SPSC-RNTI). The SPS C-RNTI is an identifier unique to the terminal device 1and used for semi-persistent scheduling. The SPS C-RNTI may be used forsemi-persistently scheduled unicast transmission.

The PDSCH is used to transmit downlink data (downlink shared channel(DL-SCH)). The PDSCH is used to transmit a system information message.Here, the system information message may be cell-specific information(information unique to a cell). The system information is included inRRC signaling. The PDSCH is used to transmit the RRC signaling and theMAC control element.

The PMCH is used to transmit multicast data (multicast channel (MCH)).

In FIG. 1, the following downlink physical signals are used for downlinkradio communication. Here, the downlink physical signals are not used totransmit the information output from the higher layers but is used bythe physical layer.

-   -   Synchronization signal (SS)    -   Downlink reference signal (DL RS)

The synchronization signal is used in order for the terminal device 1 tobe synchronized in terms of frequency and time domains for downlink. Inthe TDD scheme, the synchronization signal is mapped to subframes 0, 1,5, and 6 within a radio frame. In the FDD scheme, the synchronizationsignal is mapped to subframes 0 and 5 within a radio frame.

The downlink reference signal is used in order for the terminal device 1to perform channel compensation for the downlink physical channel. Thedownlink reference signal is used in order for the terminal device 1 toobtain the downlink channel state information.

According to the present embodiment, the following five types ofdownlink reference signals are used.

Cell-specific reference signal (CRS)

UE-specific reference signal (URS) associated with the PDSCH

Demodulation reference signal (DMRS) associated with the EPDCCH

Non-zero power channel state information-reference signal (NZP CSI-RS)

Zero power channel state information-reference signal (ZP CSI-RS)

Multimedia broadcast and multicast service over single frequency networkreference signal (MBSFN RS)

Positioning reference signal (PRS)

Here, the downlink physical channel and the downlink physical signal arecollectively referred to as a downlink signal. The uplink physicalchannel and the uplink physical signal are collectively referred to asan uplink signal. The downlink physical channel and the uplink physicalchannel are collectively referred to as a physical channel. The downlinkphysical signals and the uplink physical signals are collectivelyreferred to as a physical signal.

The BCH, the MCH, the UL-SCH, and the DL-SCH are transport channels. Achannel used in the medium access control (MAC) layer is referred to asa transport channel. The unit of the transport channel used in the MAClayer may also be referred to as a transport block (TB) or a MACprotocol data unit (PDU). Control of a hybrid automatic repeat request(HARQ) is performed on each transport block in the MAC layer. Thetransport block is a unit of data that the MAC layer delivers to thephysical layer. In the physical layer, the transport block is mapped toa codeword and subject to coding processing on a codeword-by-codewordbasis.

Carrier aggregation will be described below.

In the present embodiment, one or multiple serving cells may beconfigured for the terminal device 1. A technology in which the terminaldevice 1 communicates via multiple serving cells is referred to as cellaggregation or carrier aggregation.

Here, the present embodiment may apply to one or each of the multipleserving cells configured for the terminal device 1. Alternatively, thepresent embodiment may apply to one or some of the multiple servingcells configured for the terminal device 1. Alternatively, the presentembodiment may apply to one or each of the multiple serving cell groups(e.g., PUCCH cell groups) configured for the terminal device 1, whichwill be described later. Alternatively, the present embodiment may applyto one or some of the multiple serving cell groups configured for theterminal device 1.

In the present embodiment, time division duplex (TDD) and/or frequencydivision duplex (FDD) may be applied. Here, for carrier aggregation, TDDor FDD may apply to one or all of the multiple serving cells.Alternatively, serving cells to which TDD applies and serving cells towhich FDD applies may be aggregated. Here, a frame structure for FDD isalso referred to as frame structure type 1. A frame structure for TDD isreferred to as frame structure type 2.

Here, the one or multiple configured serving cells include one primarycell and one or multiple secondary cells. The primary cell may be aserving cell in which an initial connection establishment procedure hasbeen performed, a serving cell in which a connection re-establishmentprocedure has been initiated, or a cell indicated as the primary cell ina handover procedure. Here, upon an RRC connection being established orlater, a secondary cell(s) may be configured.

Here, a carrier corresponding to a serving cell in the downlink isreferred to as a downlink component carrier. A carrier corresponding toa serving cell in the uplink is referred to as an uplink componentcarrier. The downlink component carrier and the uplink component carrierare collectively referred to as a component carrier.

The terminal device 1 may simultaneously perform transmission and/orreception on multiple physical channels in one or multiple serving cells(component carrier(s)). Here, transmission of one physical channel maybe performed in one serving cell (component carrier) of the multipleserving cells (component carriers).

Here, the primary cell is used for the transmission on the PUCCH. Theprimary cell cannot be deactivated. The cross-carrier scheduling doesnot apply to the primary cell. In other words, the primary cell isalways scheduled via its PDCCH.

In a case where PDCCH (or PDCCH monitoring) of a secondary cell isconfigured, cross-carries scheduling may not apply this secondary cell.To be more specific, in this case, the secondary cell may always bescheduled via its PDCCH. In a case where no PDCCH (or PDCCH monitoring)of a secondary cell is configured, cross-carrier scheduling applies tothe secondary cell, and the secondary cell may always be scheduled viathe PDCCH in one other serving cell.

Here, in the present embodiment, a secondary cell used for transmissionon the PUCCH is referred to as a PUCCH secondary cell or a specialsecondary cell. In the present embodiment, a secondary cell not used totransmit a PUCCH is referred to as a non-PUCCH secondary cell, anon-special secondary cell, a non-PUCCH serving cell, or a non-PUCCHcell. The primary cell and the PUCCH secondary cell are collectivelyreferred to as a PUCCH serving cell or a PUCCH cell.

Here, the PUCCH serving cell (the primary cell or the PUCCH secondarycell) always includes a downlink component carrier and an uplinkcomponent carrier. In the PUCCH serving cell (the primary cell or thePUCCH secondary cell), PUCCH resources are configured.

The non-PUCCH serving cell (the non-PUCCH secondary cell) may include adownlink component carrier only. Alternatively, the non-PUCCH servingcell (the non-PUCCH secondary cell) may include a downlink componentcarrier and an uplink component carrier.

The terminal device 1 performs transmission on the PUCCH in the PUCCHserving cell. To be more specific, the terminal device 1 performstransmission on the PUCCH on the primary cell. Moreover, the terminaldevice 1 performs transmission on the PUCCH in the PUCCH secondary cell.To be more specific, the terminal device 1 does not perform transmissionon the PUCCH in the non-special secondary cell.

Here, the PUCCH secondary cell may be defined as a serving cell that isneither the primary cell nor a secondary cell.

To be more specific, the PUCCH secondary cell may be used for thetransmission on the PUCCH. The PUCCH secondary cell may not bedeactivated. Here, as will be described later, the PUCCH secondary cellmay be activated and/or deactivated.

Cross-carrier scheduling may not apply to PUCCH secondary cell. In otherwords, PUCCH secondary cell is always scheduled via its PDCCH in PUCCHsecondary cell. Here, cross-carrier scheduling may apply to PUCCHsecondary cell. To be more specific, the PUCCH secondary cell may bescheduled via the PDCCH in one other serving cell.

For example, in a case where PDCCH (or PDCCH monitoring) of a PUCCHsecondary cell is configured, cross-carries scheduling may not applythis PUCCH secondary cell. To be more specific, in this case, the PUCCHsecondary cell may always be scheduled via its PDCCH in the PUCCHsecondary cell. In a case where no PDCCH (or PDCCH monitoring) of thePUCCH secondary cell is configured, cross-carrier scheduling applies tothe PUCCH secondary cell, and the PUCCH secondary cell may always bescheduled via the PDCCH in one other serving cell.

Here, linking may be defined between the uplink (e.g., the uplinkcomponent carrier) and the downlink (e.g., the downlink componentcarrier). In other words, on the basis of the linking between the uplinkand the downlink, the serving cell responsible for a downlink assignment(the serving cell in which PDSCH transmission scheduled in accordancewith the downlink assignment (downlink transmission) is performed) maybe identified. Moreover, on the basis of the linking between the uplinkand the downlink, the serving cell responsible for an uplink grant (theserving cell in which transmission on the PUSCH scheduled in accordancewith the uplink grant (uplink transmission) is performed) may beidentified. Here, no carrier indicator field is present in the downlinkassignment or the uplink.

In other words, the downlink assignment received on the primary cell maycorrespond to downlink transmission on the primary cell. Moreover, theuplink grant received on the primary cell may correspond to uplinktransmission on the primary cell. The downlink assignment received inthe PUCCH secondary cell may correspond to downlink transmission on thePUCCH secondary cell. Moreover, the uplink grant received in the PUCCHsecondary cell may correspond to uplink transmission on the PUCCHsecondary cell.

The downlink assignment received in a certain secondary cell (the PUCCHsecondary cell and/or the non-PUCCH secondary cell) may correspond todownlink transmission on the certain secondary cell. Moreover, theuplink grant received in a certain secondary cell (the PUCCH secondarycell and/or the non-PUCCH secondary cell) may correspond to uplinktransmission on the certain secondary cell.

Here, the base station device 3 may configure one or multiple servingcells through higher layer signaling. For example, one or multiplesecondary cells may form a set of multiple serving cells with theprimary cell. Here, the serving cells configured by the base stationdevice 3 may include a PUCCH secondary cell.

To be more specific, the PUCCH secondary cell may be configured by thebase station device 3. For example, the base station device 3 maytransmit higher layer signals that include information that may be usedto configure the PUCCH secondary cell.

The base station device 3 may activate or deactivate one or multipleserving cells through higher layer signaling (e.g., a MAC controlelement). For example, the activation or deactivation mechanism may bebased on a combination of the MAC control element and a deactivationtimer.

Here, secondary cells activated or deactivated by the base stationdevice 3 may include a PUCCH secondary cell. To be more specific, thebase station device 3 may solely activate or deactivate multiplesecondary cells including the PUCCH secondary cell through a singleactivation/deactivation command. In other words, the base station device3 may transmit the single activation/deactivation command to be used toactivate or deactivate secondary cells through the MAC control element.

As a value for the deactivation timer, a common value may be set foreach terminal device 1 by the higher layers (e.g., the RRC layer). Thedeactivation timer (the value of the timer) may be maintained for (applyto) each of the secondary cells. Here, the deactivation timer (the valueof the timer) may be maintained for each of the non-PUCCH secondarycells only. In other words, the terminal device 1 may maintain (apply)the deactivation timer for (to) each of the non-PUCCH secondary cellsonly, without applying the deactivation timer to the PUCCH secondarycells.

Alternatively, a deactivation timer for PUCCH secondary cells and adeactivation timer for non-PUCCH secondary cells may be configuredseparately. For example, the base station device 3 may transmit higherlayer signaling including the deactivation timer for the PUCCH secondarycells and information on the configuration of the deactivation timer.Moreover, the base station device 3 may transmit higher layer signalingincluding the deactivation timer for the non-PUCCH secondary cells andinformation on the configuration of the deactivation timer.

A configuration of a slot according to the present embodiment will bedescribed below.

FIG. 2 is a diagram illustrating the configuration of the slot accordingto the present embodiment. In FIG. 2, the horizontal axis represents atime axis, and the vertical axis represents a frequency axis. Here, anormal cyclic prefix (CP) may apply to an OFDM symbol. Alternatively, anextended cyclic prefix (CP) may apply to the OFDM symbol. The physicalsignal or the physical channel transmitted in each of the slots isexpressed by a resource grid.

Here, in the downlink, the resource grid may be defined with multiplesubcarriers and multiple OFDM symbols. In the uplink, the resource gridmay be defined with multiple subcarriers and multiple SC-FDMA symbols.The number of subcarriers constituting one slot may depend on a cellbandwidth. The number of OFDM symbols or SC-FDMA symbols constitutingone slot may be seven. Here, each element within the resource grid isreferred to as a resource element. The resource element may beidentified by a subcarrier number and an OFDM symbol or SC-FDMA symbolnumber.

Here, a resource block may be used to express mapping of a certainphysical channel (the PDSCH, the PUSCH, or the like) to resourceelements. For the resource block, a virtual resource block and aphysical resource block may be defined. A certain physical channel maybe first mapped to the virtual resource block. Thereafter, the virtualresource block may be mapped to the physical resource block. Onephysical resource block may be defined with seven consecutive OFDMsymbols or SC-FDMA symbols in the time domain and by 12 consecutivesubcarriers in the frequency domain. Thus, one physical resource blockmay be constituted of (7×12) resource elements. Furthermore, onephysical resource block may correspond to one slot in the time domainand correspond to 180 kHz in the frequency domain. The physical resourceblocks may be numbered from zero in the frequency domain.

FIGS. 3A to 3C are diagrams illustrating PUCCH cell groups according tothe present embodiment. In FIGS. 3A to 3C, three examples (Example (a),Example (b), and Example (c)) are provided as examples of aconfiguration (constitution or definition) of a PUCCH cell group. Here,in the present embodiment, a group of multiple serving cells may bereferred to as a PUCCH cell group. The PUCCH cell group may be a groupassociated with transmission on the PUCCH (transmission of uplinkcontrol information on the PUCCH). Here, a certain serving cell belongsto any one of PUCCH cell groups. Here, it goes without saying that thePUCCH cell group may be configured differently from the examplesillustrated in FIGS. 3A to 3C.

The secondary PUCCH cell group may be configured by the base stationdevice 3. For example, the base station device 3 may transmit higherlayer signallings that include information (or index, or cell groupindex) that may be used to configure the PUCCH cell group.

Naturally, aspects of the present embodiment may be applied to one or aplurality of serving cell groups other than the above-described PUCCHcell group. For example, the base station device 3 may configure one ora plurality of groups of serving cells corresponding to the serving cellinstructed by the carrier indicator field (CIF). Here, the base stationdevice 3 may configure one or multiple serving cells through associationwith the uplink transmission. Further, the base station device 3 mayconfigure one or multiple serving cells through association with thedownlink transmission.

In the following description, a group of one or more serving cellsconfigured by the base station device 3 may also be referred to as acell group. That is, the PUCCH cell group is included in the cell group.Herein, the base station device 3 and/or the terminal device 1 mayexecute the operations described with respect to the present embodimentin each of the cell groups. To be more specific, the base station device3 and/or the terminal device 1 may perform the operations described withrespect to the present embodiment in one cell group.

Herein, for example, the base station device 3 and/or the terminaldevice 1 of the present embodiment may support carrier aggregation of upto 32 downlink component carriers (downlink cells), for example. Inother words, the base station device 3 and/or the terminal device 1 cansimultaneously perform transmission and/or reception on multiplephysical channels in up to 32 serving cells. Here, the number of uplinkcomponent carriers may be less than the number of downlink componentcarriers.

Herein, for example, the base station device 3 and/or the terminaldevice 1 of the present embodiment may support carrier aggregation of upto 5 downlink component carriers (downlink cells). In other words, thebase station device 3 and/or the terminal device 1 can simultaneouslyperform transmission and/or reception on multiple physical channels inup to 5 serving cells. Here, the number of uplink component carriers maybe less than the number of downlink component carriers.

FIG. 3A illustrates that a first PUCCH cell group and a second cellgroup are configured as a cell group (the PUCCH cell groups). Forexample, in FIG. 3A, the base station device 3 may transmit a downlinksignal in the first cell group, and the terminal device 3 may transmitan uplink signal in the first cell group (may transmit uplink controlinformation on the PUCCH in the first cell group). For example, in acase where 20 serving cells (downlink component carriers or downlinkcells) are configured or activated in the first cell group, the basestation device 3 and the terminal device 1 may transmit and receiveuplink control information for the 20 downlink component carriers,respectively.

To be more specific, the terminal device 1 may transmit HARQ-ACK for the20 downlink component carriers (HARQ-ACK for PDSCH transmission andHARQ-ACK for transport blocks). The terminal device 1 may transmit CSIcorresponding to each of the 20 downlink component carriers. Theterminal device 1 may transmit SRs for each cell group. Similarly, thebase station device 3 and the terminal device 1 may transmit and receiveuplink control information in the second cell group, respectively.

Similarly, the base station device 3 and the terminal device 1 mayconfigure a cell group as illustrated in FIG. 3B, and transmit andreceive uplink control information, respectively. Also, the base stationdevice 3 and the terminal device 1 may configure a cell group asillustrated in FIG. 3C, and transmit and receive uplink controlinformation respectively.

Herein, one cell group (e.g., a PUCCH cell group) may include at leastone serving cell (e.g., a PUCCH serving cell). Additionally, in certainembodiments, one cell group (e.g., a PUCCH cell group) may include onlyone serving cell (e.g., only one PUCCH serving cell). Further, forexample, one PUCCH cell group may include one PUCCH serving cell and oneor multiple non-PUCCH serving cells.

Herein, cell groups including the primary cell may be referred to asprimary cell groups. Further, cell groups that do not include theprimary cell are referred to as secondary cell groups. PUCCH cell groupsincluding the primary cell may be referred to as primary PUCCH cellgroups. PUCCH cell groups that do not include the primary cell may bereferred to as secondary PUCCH cell groups.

In other words, the secondary PUCCH cell group may include a PUCCHsecondary cell. For example, the index for the primary PUCCH cell groupmay always be defined as 0. The index for the secondary PUCCH cell groupmay be configured by the base station device 3 (or a network device).

The base station device 3 may transmit information, to be used toindicate the PUCCH secondary cell, included in higher layer signalingand/or the PDCCH (downlink control information transmitted on thePDCCH). The terminal device 1 may determine the PUCCH secondary cell inaccordance with the information to be used to indicate the PUCCHsecondary cell. Herein, the cell index of the PUCCH secondary cell maybe predefined according to specification information and the like.

As described above, the PUCCH in the PUCCH serving cell may be used totransmit uplink control information (HARQ-ACK, CSI (e.g., periodic CSI),and/or SR) for serving cells (the PUCCH serving cell and the non-PUCCHserving cell) included in the PUCCH cell group to which the PUCCHserving cell belongs.

In other words, uplink control information (HARQ-ACK, CSI (e.g.,periodic CSI), and/or SR) for the serving cells (the PUCCH serving celland the non-PUCCH serving cell) included in the PUCCH cell group istransmitted on the PUCCH in the PUCCH serving cell included in the PUCCHcell group.

Here, the present embodiment may apply only to transmission of HARQ-ACK.Alternatively, the present embodiment may apply only to transmission ofCSI (e.g., periodic CSI). Alternatively, the present embodiment mayapply only to transmission of SR. Alternatively, the present embodimentmay apply to transmission of HARQ-ACK, transmission of CSI (e.g.,periodic CSI), and/or transmission of SR.

In other words, for example, a cell group (or the PUCCH cell group) maybe configured for transmission of HARQ-ACK. A cell group (or the PUCCHcell group) may be configured for transmission of CSI (e.g., periodicCSI). A cell group (or the PUCCH cell group) may be configured fortransmission of SR.

For example, a cell group for transmission of HARQ-ACK, a cell group fortransmission of CSI (e.g., periodic CSI), and/or a cell group fortransmission of SR may be configured separately. Alternatively, a sharedcell group may be configured as a cell group for transmission ofHARQ-ACK, a cell group for transmission of CSI (e.g., periodic CSI),and/or a cell group for transmission of SR.

Herein, the number of cell groups used for transmission of HARQ-ACK maybe one or two. The number of cell groups used for transmission of CSImay be one or two. The number of cell groups used for transmission of SRmay be one or two. As will be described later, a cell group fortransmission of CSI (e.g., periodic CSI) and/or a cell group fortransmission of SR need not be configured (defined).

Here, multiple formats may be defined (supported) for the PUCCH. Eachformat supported for the PUCCH (the format that the PUCCH supports) isalso referred to as a PUCCH format. For example, the use of thefollowing PUCCH formats allows combinations of pieces of uplink controlinformation on the PUCCH (transmission of combinations of pieces ofuplink control information) to be supported.

-   -   Format 1    -   Format 1a    -   Format 1b    -   Format 2    -   Format 2a    -   Format 2b    -   Format 3    -   Format 4

PUCCH format 1 may be defined for positive SR. For example, the positiveSR may be used to indicate that an UL-SCH resource is requested. Here,negative SR may be used to indicate that an UL-SCH resource is notrequested. PUCCH format 1 is also referred to as a first PUCCH formatbelow.

PUCCH format 1a may be defined for 1-bit HARQ-ACK or 1-bit HARQ-ACK withpositive SR. PUCCH format 1b may be defined for 2-bit HARQ-ACK or 2-bitHARQ-ACK with positive SR. PUCCH format 1b may be defined fortransmission of up to 4-bit HARQ-ACK with channel selection. PUCCHformat 1a and/or PUCCH format 1b is also referred to as a second PUCCHformat below.

PUCCH format 2 may be defined for a CSI report when not multiplexed withHARQ-ACK. PUCCH format 2a may be defined for a CSI report multiplexedwith 1-bit HARQ-ACK. PUCCH format 2b may be defined for a CSI reportmultiplexed with 1-bit HARQ-ACK. Here, PUCCH format 2 may be defined fora CSI report multiplexed with HARQ-ACK for extended cyclic prefix. PUCCHformat 2, PUCCH format 2a, and/or PUCCH format 2b is also referred to asa third PUCCH format below.

PUCCH format 3 may be defined for up to 10-bit HARQ-ACK. For example,PUCCH format 3 may be defined for up to 10-bit HARQ-ACK for FDD orFDD-TDD primary cell frame structure type 1.

PUCCH format 3 may be defined for up to 20-bit HARQ-ACK. For example,PUCCH format 3 may be defined for up to 20-bit HARQ-ACK for TDD. Also,the PUCCH format 3 may be defined for up to 21-bit HARQ-ACK. Forexample, PUCCH format 3 may be defined for up to 21-bit HARQ-ACK for FDDor FDD-TDD primary cell frame structure type 2.

Alternatively, PUCCH format 3 may be defined for up to 11-bitcorresponding to up to 10-bit HARQ-ACK and 1-bit positive/negative SR.Herein, for example, PUCCH format 3 may be defined for 11-bits or lesscorresponding to 10-bit HARQ-ACK and 1-bit positive/negative SR may bedefined for FDD or FDD-TDD.

Alternatively, PUCCH format 3 may be defined for up to 21-bitcorresponding to up to 20-bit HARQ-ACK and 1-bit positive/negative SR.Herein, PUCCH format 3 may be defined for 21 bits or less correspondingto 20-bit HARQ-ACK and 1 bit positive/negative SR for TDD. Additionally,PUCCH format 3 may be defined for up to 22 bits or less corresponding to21 bit HARQ-ACK and 1 bit positive/negative SR. Herein, for FDD-TDDprimary cell frame structure type 2, PUCCH format 3 may be defined for22 bits or less corresponding to 21-bit HARQ-ACK and 1 bitpositive/negative SR.

Herein, in the case where the uplink control information (HARQ-ACK, SR,and/or CSI) is transmitted using PUCCH format 3, a first coding method(e.g., Reed Muller coding or (32, 0) block coding) may be used. Herein,for example, reference sequences (basis sequences) for (32, 0) blockcode may be provided in advance by specification information or thelike.

PUCCH format 3 may be defined for HARQ-ACK and a CSI report for oneserving cell. Alternatively, PUCCH format 3 may be defined for HARQ-ACK,1-bit positive/negative SR (if any), and a CSI report for one servingcell. PUCCH format 3 is also referred to as a fourth PUCCH format below.

PUCCH format 4 may be defined for HARQ-ACK corresponding to up to 32serving cells (downlink component carriers or downlink cells).Alternatively, PUCCH format 4 may be defined for HARQ-ACK and a CSIreport. Alternatively, PUCCH format 4 may be defined for HARQ-ACK andSR. Alternatively, PUCCH format 4 may be defined for HARQ-ACK, SR, and aCSI report. Here, the CSI report may be a CSI report for one servingcell. Alternatively, the CSI report may be a CSI report for multipleserving cells. SR may be positive SR and/or negative SR. PUCCH format 4is also referred to as a fifth PUCCH format below.

Herein, in the case where the uplink control information (HARQ-ACK, SR,and/or CSI) is transmitted using PUCCH format 4, a second coding method(e.g., Tail biting convolutional encoder (Tail biting convolutionalcoding) or Turbo encoder (Turbo coding)) may be used.

That is, the number of bits per subframe transmitted (transmittable)using PUCCH format 4 may be greater than the number of bits per subframetransmitted (transmittable) using PUCCH format 3. More particularly, theamount of information per subframe transmitted (transmittable) usingPUCCH format 4 may be larger than the amount of information transmitted(transmittable) per subframe using PUCCH format 3. Also, as describedabove, different coding methods may be used with respect to transmissionof uplink control information using PUCCH format 3 and transmission ofuplink control information using PUCCH format 4.

Herein, in the case where the HARQ-ACK is transmitted using the thirdPUCCH format, the terminal device 1 may determine the number of HARQ-ACKbits at least on the basis of the number of configured serving cells andthe downlink transmission mode configured for each serving cell (each ofthe configured serving cells). Herein, in the case where the HARQ-ACK istransmitted using a fifth PUCCH format, the terminal device 1 maydetermine the number of HARQ-ACK bits at least on the basis of thenumber of configured or activated serving cells and the downlinktransmission mode configured for each serving cell (each of theconfigured or activated serving cells).

Also, in the case where the HARQ-ACK is transmitted using a fourth PUCCHformat, the terminal device 1 may determine the number of HARQ-ACK bitsat least on the basis of the number of configured serving cells and thedownlink transmission mode configured for each serving cell (each of theconfigured serving cells). Herein, in the case where the HARQ-ACK istransmitted using a fifth PUCCH format, the terminal device 1 maydetermine the number of HARQ-ACK bits at least on the basis of thenumber of configured or activated serving cells and the downlinktransmission mode configured for each serving cells (each of theconfigured or activated serving cells).

For example, the terminal device 1 may use a 2-bit HARQ-ACK for servingcells for which a downlink transmission mode supporting up to twotransport blocks is configured, and may otherwise use 1-bit HARQ-ACK(e.g., for serving cells for which a downlink transmission modesupporting one transport block is configured). Herein, for example,downlink transmission modes supporting up to two transport blocks mayinclude transmission mode 3, transmission mode 4, transmission mode 8,transmission mode 9, and/or transmission mode 10. Also, downlinktransmission modes supporting one transport block may includetransmission mode 1, transmission mode 2, transmission mode 5,transmission mode 6, and/or transmission mode 7.

As described above, the base station device 3 may configure the servingcell to the terminal device 1 using a higher layer signaling (e.g., RRCsignaling). Also, the base station device 3 may configure the downlinktransmission mode for the terminal device 1 using a higher layersignaling (e.g., RRC signaling). For example, the base station device 3may configure the downlink transmission mode related to PDSCHtransmission for the terminal device 1. For transmission of HARQ-ACKusing the third PUCCH format and/or the fourth PUCCH format, the numberof HARQ-ACK bits may be determined in the RRC layer (based oninformation in the RRC layer).

Herein, the base station device 3 may configure, through higher layersignaling (information transmitted using higher layer signaling) and/orthe PDCCH (downlink control information transmitted on the PDCCH), theterminal device 1 to make use of any one of PUCCH format 1b with channelselection, PUCCH format 3, or PUCCH format 4 for transmission of uplinkcontrol information (e.g., HARQ-ACK transmission). In other words, thebase station device 3 may configure, through higher layer signaling, theterminal device 1 to use PUCCH format 1b with channel selection fortransmission of uplink control information. Also, the base stationdevice 3 may configure the terminal device 1 to use the PUCCH format 3for transmission of the uplink control information. Also, the basestation device 3 may configure the terminal device 1 to use the PUCCHformat 4 for transmission of the uplink control information.

For example, the base station device 3 may configure the terminal device1 to use one of the PUCCH format 1b with channel selection, the PUCCHformat 3, and/or the PUCCH format 4 for each cell group. In other words,the base station device 3 may independently configure, for each cellgroup, the terminal device 1 to use one of the PUCCH format 1b withchannel selection, the PUCCH format 3, and/or the PUCCH format 4. Thatis, the terminal device 1 may be configured by the base station device 3to use one of the PUCCH format 1b with channel selection, the PUCCHformat 3, and/or the PUCCH format 4.

Also, in the case where more than one serving cell (e.g., more than onebut less than 5) are configured with frame structure type 1 and/or framestructure type 2, the terminal device 1 may be configured, by the basestation device 3, to use one of the PUCCH format 1b with channelselection, the PUCCH format 3, and/or the PUCCH format 4. Further, inthe case where more than 5 serving cells are configured with framestructure type 1 and/or frame structure type 2, the terminal device 1may be configured, by the base station device 3, to use one of the PUCCHformat 1b with channel selection, PUCCH format 3, or PUCCH format 4.

Although the following description describes operations in the terminaldevice 1, it is a matter of course that the base station device 3 mayperform corresponding actions with respect to the terminal device 1.Also, the operations described below in accordance with the presentembodiment may be performed individually for each cell group. To be morespecific, the base station device 3 and/or the terminal device 1 mayperform the operations to be described in accordance with the presentembodiment within a single cell group.

Further, for example, the operations described with respect to thepresent embodiment may also be applied to the case where the PUCCHformat 3 is configured for transmission of the uplink controlinformation (e.g., transmission of HARQ-ACK). Also, for example, theoperations described with respect to the present embodiment may also beapplied to the case where the PUCCH format 4 is configured fortransmission of the uplink control information (e.g., transmission ofHARQ-ACK).

Further, the operations described in the present embodiment may beapplicable to a case where one serving cell is configured. Further, theoperations described in the present embodiment may be applicable to acase where more than one serving cells are configured. Further, theoperations described in the present embodiment may be applicable to acase where more than five serving cells are configured. Herein, the casewhere more than one serving cell is configured may refer to a case wheremore than one but less than 5 serving cells are configured.

FIG. 4 is a diagram illustrating a method to transmit uplink controlinformation according to the present embodiment.

Hereinafter, a subframe in which PDCCH detection and PDSCH transmission(PDSCH decoding) based on the detection of the PDCCH are performed isalso referred to as a first subframe. For example, the first subframe isrepresented as subframe n−4. Moreover, a subframe in which transmissionof HARQ-ACK for PDSCH transmission (PDSCH decoding) is also referred toas a second subframe. For example, the second subframe is represented assubframe n.

For example, for the PDSCH transmission indicated by the detection ofthe PDCCH in the first subframe, the terminal device 1 may transmit theHARQ-ACK using the first PUCCH resource and/or the second PUCCH formatin the second subframe. To be more specific, when HARQ-ACK istransmitted using the second PUCCH format by the terminal device 1, thefirst PUCCH resource may be used.

In addition, for the PDSCH transmission indicated by the detection ofthe PDCCH in the first subframe, the terminal device 1 may transmit theHARQ-ACK using the third PUCCH resource and/or the fourth PUCCH formatin the second subframe. To be more specific, when HARQ-ACK istransmitted using the fourth PUCCH format by the terminal device 1, thethird PUCCH resource may be used.

In addition, for the PDSCH transmission indicated by the detection ofthe PDCCH in the first subframe, the terminal device 1 may transmit theHARQ-ACK using the fourth PUCCH resource and/or the fifth PUCCH formatin the second subframe. To be more specific, when HARQ-ACK istransmitted using the fifth PUCCH format by the terminal device 1, thefourth PUCCH resource may be used. Note that the first PUCCH resource,the third PUCCH resource, and the fourth PUCCH resource will bedescribed later herein.

Here, for example, the terminal device 1 may use different PUCCH formatsand/or different PUCCH resources for transmission of HARQ-ACK based onthe serving cell(s) (and/or the cell index value(s) of the servingcell(s)) on which PDSCH transmission(s) is scheduled. In addition, theterminal device 1 may use different PUCCH formats and/or different PUCCHresources for transmission of HARQ-ACK based on the serving cell(s)(and/or the cell index value(s) of the serving cell(s)) on which PDSCHtransmission(s) is scheduled and the number of bits (e.g., the totalnumber of bits in a subframe corresponding to HAQ-ACK, SR, and/or CSI)of the uplink control information in the corresponding subframe.

Here, the cell index may include a secondary index (also referred to asa Scelllndex) associated with the identity used to identify thesecondary cell. (The Information Element ‘Scelllndex’ concerns a shortidentity, used to identify an SCell.) Also, the cell index may include aserving cell index (also referred to as a ServCelllndex) associated withthe identity used to identify the serving cell. (The Information Element‘ServCelllndex’ concerns a short identity, used to identify a servingcell (i.e. the PCell or an Scell).)

Here, a value of “0” for the serving cell index may be applied to theprimary cell. Also, the value of the allocated secondary cell index maybe used as the value of the serving cell index applied to the secondarycell. In the following, the secondary cell index (Scelllndex) and/or theserving cell index (ServCelllndex) may also be referred to as a cellindex.

Here, the base station device 3 may configure the cell index (cell indexvalue) for the terminal device 1. For example, the base station device 3may transmit a higher layer signaling that includes a cell index. Theterminal device 1 may identify the cell index of the serving cell basedon the cell index set by the base station device 3. In other words, thecell index may be an index in the higher layer (also referred to as anindex in the RRC layer or an index of the RRC).

Herein, for the PDSCH transmission only on the primary cell, theterminal device 1 may transmit the HARQ-ACK using the second PUCCHformat. That is, for the PDSCH transmission only on the serving cellwith a cell index of “0” (ServCellIndex=0), the terminal device 1 maytransmit the HARQ-ACK using the second PUCCH format.

In addition, for the PDSCH transmission only on the PUCCH secondarycell, the terminal device 1 may transmit HARQ-ACK using the second PUCCHformat. Also, for the PDSCH transmission only on the PUCCH secondarycell, the terminal device 1 may transmit HARQ-ACK using a first PUCCHresource (hereinafter also referred to as a 1-1 PUCCH resource)configured by the higher layer (the HARQ-ACK may be transmitted usingthe 1-1 PUCCH resource and/or the second PUCCH format). For example, thebase station device 3 may transmit the higher layer signaling includinginformation that may be used to configure the 1-1 PUCCH resource.

To be more specific, for PDSCH transmission only on the PUCCH secondarycell, the terminal device 1 may transmit HARQ-ACK using a first PUCCHresource (1-1 PUCCH resource) that differs from the first PUCCH resourcethat is used for HARQ-ACK transmission for PDSCH transmission only onthe primary cell.

Here, for example, the first PUCCH resource (the 1-1 PUCCH resource)that differs from the first PUCCH resource may refer to a PUCCH resourceindicated (configured) to have a source index different from theresource index for the first PUCCH resource. In addition, the firstPUCCH (the 1-1 PUCCH resource) resource that differs from the firstPUCCH resource may refer to a PUCCH resource indicated (configured) tohave an orthogonal sequence index different from the orthogonal sequenceindex for the first PUCCH resource. Also, the first PUCCH resource (the1-1 PUCCH resource) that differs from the first PUCCH resource may referto a PUCCH resource indicated (configured) to have a cyclic shift valuedifferent from the cyclic shift for the first PUCCH resource.

Further, for the PDSCH transmission only on the PUCCH secondary cell,the terminal device 1 may transmit the HARQ-ACK using the fourth PUCCHformat. Also, for the PDSCH transmission only on the PUCCH secondarycell, the terminal device 1 may transmit the HARQ-ACK using the fifthPUCCH format. As described above, for example, the base station device 3may configure(indicate), for the terminal device 1, which of the fourthPUCCH format or the fifth PUCCH format is to be used.

Further, for the PDSCH transmission on the secondary cell, the terminaldevice 1 may transmit the HARQ-ACK using the fourth PUCCH format. Inother words, for the PDSCH transmission on at least one secondary cell,the terminal device 1 may transmit the HARQ-ACK using the fourth PUCCHformat. Here, the secondary cell may include the PUCCH secondary cell.Also, the secondary cell may not include the PUCCH secondary cell. Inother words, the secondary cell may include only the non-PUCCH secondarycell.

Further, for the PDSCH transmission on secondary cells, the terminaldevice 1 may transmit the HARQ-ACK using the fifth PUCCH format. Inother words, based on the detection of PDSCH transmission on at leastone secondary cell, the terminal device 1 may transmit the HARQ-ACKusing the fifth PUCCH format. Here, the secondary cell may include thePUCCH secondary cell. Also, the secondary cell may not include the PUCCHsecondary cell. In other words, the secondary cell may include only thenon-PUCCH secondary cell.

Herein, for the PDSCH transmission(s) on the secondary cell(s) having acell index less than or equal to a first predetermined value, theterminal device 1 may transmit the HARQ-ACK using the fourth PUCCHformat. In other words, for the PDSCH transmission(s) on the secondarycell(s) having a cell index less than or equal to the firstpredetermined value indicated by the detection of PDCCH in a firstsubframe, the terminal device 1 may transmit the HARQ-ACK using thefourth PUCCH format in a second subframe.

In other words, for the PDSCH transmission(s) on the secondary cell(s)having a cell index value smaller than a second predetermined value, theterminal device 1 may transmit the HARQ-ACK using the fourth PUCCHformat. In other words, for the PDSCH transmission(s) on the secondarycell(s) having a cell index value smaller than a second predeterminedvalue indicated by the detection of PDCCH in a first subframe, theterminal device 1 may transmit the HARQ-ACK using the fourth PUCCHformat in a second subframe.

Further, for the PDSCH transmission(s) on the secondary cell(s) having acell index value greater than a first predetermined value, the terminaldevice 1 may transmit the HARQ-ACK using the fifth PUCCH format. Inother words, for the PDSCH transmission(s) on the secondary cell(s)having a cell index value greater than a first predetermined valueindicated by the detection of PDCCH in a first subframe, the terminaldevice 1 may transmit the HARQ-ACK using the fifth PUCCH format in asecond subframe.

In other words, for the PDSCH transmission(s) on the secondary cell(s)having a cell index value greater than or equal to a secondpredetermined value, the terminal device 1 may transmit the HARQ-ACKusing the fourth PUCCH format. In other words, for the PDSCHtransmission(s) on the secondary cell(s) having a cell index greaterthan or equal to a second predetermined value indicated by the detectionof PDCCH in a first subframe, the terminal device 1 may transmit theHARQ-ACK using the fourth PUCCH format.

Herein, for example, the “first predetermined value” (or the “secondpredetermined value”) may be predetermined by the specification or thelike, and may be a value known between the base station device 3 and theterminal device 1. Herein, the value of the cell index applied to theprimary cell may not be included in the first predetermined value (orthe second predetermined value). In other words, the first predeterminedvalue (or the second predetermined value) may be any one of the cellindex values set by the base station device 3 using the secondary cellindex.

For example, the first predetermined value may be a value such as “4” or“9”. For example, for the TDD, the first predetermined value may be “4”.For example, for the FDD, the first predetermined value may be “9”. Asanother example, for the TDD and the FDD, the first predetermined valuemay be “4”.

The first predetermined value may be configured by the base stationdevice 3. As an example, the base station device 3 may select the firstpredetermined value, and transmit information indicating the firstpredetermined value to the terminal device 1. Further, the secondpredetermined value may be configured by the base station device 3. Asan example, the base station device 3 may select the secondpredetermined value, and transmit information indicating the secondpredetermined value to the terminal device 1. For example, the basestation device 3 may transmit the higher layer signaling that includesinformation indicating the first predetermined value or the firstpredetermined value.

Also, for example, the first predetermined value may be the “fourthsmallest (lowest) value” or the “ninth smallest value” among the cellindices configured by the base station device 3. In other words, thefirst predetermined value may be the “fourth value” or the “ninth value”in the case where the values of the cell indices configured by the basestation device 3 are arranged in ascending order.

For example, for the TDD, the first predetermined value may be the“fourth value” in the case where the values of the cell indicesconfigured by the base station device 3 are arranged in ascending order.In the same way, for the FDD, the first predetermined value may be the“ninth value” in the case where the values of the cell indicesconfigured by the base station device 3 are arranged in ascending order.In addition, for the TDD and the FDD, the first predetermined value maybe the “fourth value” in the case where the values of the cell indicesconfigured by the base station device 3 are arranged in ascending order.

In the same way, for example, the second predetermined value may be avalue such as “5” or “10”. For example, for the TDD, the secondpredetermined value may be “5”. Similarly, for the FDD, the secondpredetermined value may be “10”. As another example, for the TDD and theFDD, the second predetermined value may be “10”.

Also, for example, the second predetermined value may be the “fifthsmallest (lowest) value” or the “tenth smallest value” among the cellindices configured by the base station device 3. In other words, thesecond predetermined value may be the “fifth value” or the “tenth value”in the case where the values of the cell indices configured by the basestation device 3 are arranged in ascending order.

For example, for the TDD, the second predetermined value may be the“fifth value” in the case where the values of the cell indicesconfigured by the base station device 3 are arranged in ascending order.In the same way, for the FDD, the second predetermined value may be the“tenth value” in the case where the values of the cell indicesconfigured by the base station device 3 are arranged in ascending orderstarting. In addition, for the TDD and the FDD, the second predeterminedvalue may be the “fifth value” in the case where the values of the cellindices configured by the base station device 3 are arranged inascending order.

For example, in the case where values of “1”, “3”, “4”, “6”, “10”, “12”,“15”, and “31” are configured as cell indices for each of the eightsecondary cells by the base station device 3, the first predeterminedvalue may be “6”. In other words, in the case where cell index valuesconfigured by the base station device 3 are arranged in ascending order(that is, ordered as “1”, “3”, “4”, “6”, “10”, “12”, “15”, and “31”),the fourth value is 6. Also, in this case, the second predeterminedvalue is “10”.

That is, in this case, for PDSCH transmission(s) on the secondarycell(s) with cell index values less than or equal to “6”, the terminaldevice 1 may transmit the HARQ-ACK using the fourth PUCCH format.Further, for the PDSCH transmission(s) on the secondary cell(s) withcell index values greater than a “6”, the terminal device 1 may transmitthe HARQ-ACK using the fifth PUCCH format.

Herein, for the PDSCH transmission on the primary cell and the PDSCHtransmission(s) on the secondary cell(s) with cell index values lessthan or equal to the first predetermined value that are indicated by thedetection of two PDCCHs in a first subframe, the terminal device 1 maytransmit the HARQ-ACK using the fourth PUCCH format in a secondsubframe.

In addition, for the PDSCH transmission(s) on the secondary cell(s)having a cell index value smaller than or equal to the firstpredetermined value and the PDSCH transmission(s) on the secondarycell(s) with cell index values less than or equal to the firstpredetermined value that are indicated by the detection of two PDCCHs ina first subframe, the terminal device 1 may transmit the HARQ-ACK usingthe fourth PUCCH format in a second subframe.

Also, for the PDSCH transmission on the primary cell and the PDSCHtransmission(s) on the secondary cell(s) with cell index values greaterthan the first predetermined value that are indicated by the detectionof two PDCCHs in a first subframe, the terminal device 1 may transmitthe HARQ-ACK using the fifth PUCCH format in a second subframe.

Similarly, for the PDSCH transmission(s) on the secondary cell(s) withcell index values less than or equal to the first predetermined valueand the PDSCH transmission(s) on the secondary cell(s) with cell indexvalues greater than the first predetermined value that are indicated bythe detection of two PDCCHs in a first subframe, the terminal device 1may transmit the HARQ-ACK using the fifth PUCCH format in a secondsubframe.

Further, for the PDSCH transmission(s) on the secondary cell(s) withcell index values greater than the first predetermined value and thePDSCH transmission(s) on the secondary cell(s) with cell index valuesgreater than the first predetermined value that are indicated by thedetection of two PDCCHs in a first subframe, the terminal device 1 maytransmit the HARQ-ACK using the fifth PUCCH format in a second subframe.

In other words, the terminal device 1 may transmit the HARQ-ACK usingthe fifth PUCCH format based on at least the detection of PDSCHtransmission(s) on the secondary cell(s) with cell index values greaterthan the first determined value.

In addition, the terminal device 1 may transmit the HARQ-ACK using thefourth PUCCH format at least based on not detecting PDSCHtransmission(s) on the secondary cell(s) with cell index values greaterthan the first predetermined value and detection of PDSCHtransmission(s) on the secondary cell(s) with cell index values lessthan or equal to the first predetermined value.

Hereinafter, as described above, the terminal device 1 switching thefourth PUCCH format and the fifth PUCCH format to perform HARQ-ACKtransmission based on the serving cell on which the PDSCH is scheduledis also described as the first behavior. Herein, in the case where boththe fourth PUCCH format and the fifth PUCCH format are configured fortransmission of the HARQ-ACK, the terminal device 1 may perform thefirst behavior.

That is, in the case where the fourth PUCCH format is not configured fortransmission of the HARQ-ACK and the fifth PUCCH format is configuredfor transmission of the HARQ-ACK, the terminal device 1 may alwaystransmit the HARQ-ACK using the fifth PUCCH format. Hereinafter,performing transmission of the HARQ-ACK always using the fifth PUCCHformat will be described as the second behavior.

The base station device 3 may configure the terminal device 1 to performeither the first behavior or the second behavior. For example, the basestation device 3 may transmit the higher layer signaling includinginformation to be used to configure to perform the first behavior and/orto perform the second behavior. The terminal device 1 may perform thefirst behavior or the second behavior based on the information used toconfigure to perform the first behavior and/or to perform the secondbehavior.

FIG. 5 is a diagram illustrating a predetermined value (such as thefirst predetermined value or the second predetermined value) accordingto the present embodiment. FIG. 5 illustrates one example of processingfor a case where values of “1”, “3”, “4”, “6”, “10”, “12”, “15”, and“31” are configured by the base station device 3 as cell indices foreach of the eight secondary cells. The predetermined values (such as thefirst predetermined value and the second predetermined value) of FIG. 4may also be described with reference to FIG. 5.

Herein, in FIG. 5, a serving cell with a cell index value of “0” maycorrespond to the primary cell. Herein, in FIG. 5, it is illustratedthat a downlink transmission mode supporting up to two transport blocksmay be configured for the primary cell.

Also, in FIG. 5, it is illustrated that, for each of the serving cellswith a cell index of “3”, “6”, or “12”, a downlink transmission modethat supports up to two transport blocks may be configured. Further, itis illustrated that, for each of the serving cells with a cell index of“1”, “4”, “10”, “15”, or “31”, a downlink transmission mode thatsupports one transport block may be configured.

When the terminal device 1 transmits the HARQ-ACK, HARQ-ACK bits fordifferent serving cells may be concatenated and a concatenated bitsequence may be generated. Here, as described above, the number ofHARQ-ACK bits (bit sequence for a HARQ-ACK) may be determined based onat least the number of configured serving cells and the downlinktransmission mode configured for each serving cell (each of theconfigured serving cells).

As illustrated in FIG. 5, for example, HARQ-ACK bits may be concatenatedin ascending order of cell index value, and the first predeterminedvalue may be the maximum value (e.g., “10”) of the cell index such thatthe number of concatenated bits does not exceed a third predeterminedvalue (e.g., 10 bits). In other words, HARQ-ACK bits may be concatenatedin ascending order of cell index value, and the first predeterminedvalue may be a cell index value (e.g., “10”) when the number ofconcatenated bits is the maximum value (e.g., 9 bits) that does notexceed a third predetermined value (e.g., 10 bits).

Also, the first predetermined value may be a value that satisfies atleast the following conditions (maximum value, maximum value of the cellindex). Herein, the condition may specify that the HARQ-ACK bits aresequentially concatenated starting from a cell index of “0” up to thecell index of the first predetermined value, and the number ofconcatenated HARQ-ACK bits does not exceed a third predetermined value(e.g., 10 bits).

Also, as illustrated in FIG. 5, for example, HARQ-ACK bits may beconcatenated in ascending order of cell index value, and the secondpredetermined value may be the minimum value (e.g., “12”) of the cellindex when the number of concatenated bits exceeds a third predeterminedvalue (e.g., 10 bits). In other words, HARQ-ACK bits may be concatenatedin ascending order of cell index value, and the second predeterminedvalue may be the value of the cell index (e.g., “12”) when the number ofconcatenated HARQ-ACK bits is the minimum value (e.g., 11 bits) thatexceeds the third predetermined value (e.g., 10 bits).

Also, the second predetermined value may be a value that satisfies atleast the following conditions (minimum value, minimum value of the cellindex). Herein, the condition may specify that the HARQ-ACK bits aresequentially concatenated starting from a cell index of “0” up to thecell index of the second predetermined value, and the number ofconcatenated HARQ-ACK bits exceeds a third predetermined value (e.g., 10bits).

Herein, for example, the third predetermined value may be a valuedefined by the specification or the like and be known between the basestation device 3 and the terminal device 1. For example, the thirdpredetermined value may be “10”, “20”, or “21”. For example, for FDD orFDD-TDD primary cell frame structure type 1, the third predeterminedvalue may be 10. Also, for TDD, the third predetermined value may be“20”. Also, for FDD or FDD-TDD primary cell frame structure type 2, thethird predetermined value may be “21”.

In addition, the third predetermined value may be “11”, “22”, or “22”.For example, for FDD or FDD-TDD primary cell frame structure type 1, thethird predetermined value may be “11”. Also, for TDD, the thirdpredetermined value may be “21”. Also, for FDD or FDD-TDD primary cellframe structure type 2, the third predetermined value may be “22”.

That is, the third predetermined value may be determined based on thenumber of HARQ-ACK bits supported by the PUCCH format 3 described above(defined for the PUCCH format 3). The third predetermined value may alsobe determined based on the number of HARQ-ACK bits supported by thePUCCH format 3 described above (defined for the PUCCH format 3) as wellas the number of SR bits.

Here, in a case where cell groups (e.g., a master cell group, asecondary cell group) associated with dual connectivity are configured,the terminal device 1 may use the first PUCCH resource and the secondPUCCH format for the PDSCH transmission only on the primary secondarycell indicated by the detection of the PDCCH in the first subframe. Inthe present embodiment, the secondary cell does not include a primarysecondary cell. The master cell group may include one or multiple PUCCHcell groups. The secondary cell group may include one or multiple PUCCHcell groups.

In the case where cell groups associated with dual connectivity areconfigured, the terminal device 1 may use the third PUCCH resource andthe fourth PUCCH format, or the fourth PUCCH resource and the fifthPUCCH format, for the PDSCH transmission only on the secondary cell (thePUCCH secondary cell and/or the non-PUCCH secondary cell) indicated bythe detection of the PDCCH in the first subframe.

Here, in the dual connectivity, the terminal device 1 may(simultaneously) connect to a master eNB (MeNB) and a secondary eNB(SeNB). In a case where the dual connectivity is configured, two MACentities may be configured for the terminal device 1. Here, one of thetwo MAC entities may indicate a MAC entity for the master cell group.The other of the two MAC entities may indicate a MAC entity for thesecondary cell group. In a case where the dual connectivity is notconfigured, one MAC entity may be configured for the terminal device 1.

FIG. 6 is a diagram illustrating a method to process uplink controlinformation according to the present embodiment. Here, FIG. 6illustrates a processing method to be used when the uplink controlinformation (e.g., HARQ-ACK) is transmitted using the fourth PUCCHformat. Also, FIG. 6 illustrates a processing method to be used when theuplink control information (e.g., HARQ-ACK) is transmitted using thefifth PUCCH format.

As illustrated in FIG. 6, for example, the HARQ-ACK bit sequence, whichis a result of concatenating HARQ-ACK bits for different serving cells,may be composed by sequentially concatenating cell index values inascending order until the number of serving cells configured by thehigher layer is reached. Herein, the serving cells configured by thehigher layer may include the primary cell. For example, when “0” isconfigured as the cell index for the primary cell, and “1”, “3”, “4”,“6”, “10”, “12”, “15”, and “31” are provided as the cell indices foreach of the eight secondary cells, the HARQ-ACK bit sequence may beconcatenated in the order “0”, “1”, “3”, “4”, “6”, “10”, “12”, “15”,“31”.

Furthermore, in the processing for each serving cell, the HARQ-ACK bitsequence may be concatenated based on the downlink transmission mode.For example, when a downlink transmission mode that supports onetransport block is configured for a particular cell, a 1-bit HARQ-ACKbit may be concatenated. Also, when a downlink transmission mode thatsupports two transport blocks is configured for a particular cell, a2-bit HARQ-ACK bits may be concatenated.

That is, the terminal device 1 may use the fourth PUCCH format totransmit a HARQ-ACK bit sequence (or HARQ-ACK) provided based on theprocessing illustrated in FIG. 6. That is, the terminal device 1 may usethe fifth PUCCH format to transmit a HARQ-ACK bit sequence (or aHARQ-ACK) provided based on the processing illustrated in FIG. 6.

FIG. 7 is a diagram illustrating a method to process uplink controlinformation according to the present embodiment. Here, FIG. 7illustrates a processing method to be used when the uplink controlinformation (e.g., HARQ-ACK) is transmitted using the fourth PUCCHformat.

As illustrated in FIG. 7, for example, the HARQ-ACK bit sequence, whichis a result of concatenating HARQ-ACK bits for different serving cells,may be composed by sequentially concatenating cell index values inascending order. Herein, the HARQ-ACK bit sequence may be formed bycomparing the number of serving cells configured by the higher layer anda fourth predetermined value, and concatenating up to the smaller value.For example, in a case where the number of serving cells configured bythe higher layer is 24 and the fourth predetermined value is 5, theHARQ-ACK bit sequence may be concatenated up to 5. That is, in thiscase, the HARQ-ACK bit sequence is concatenated from the smallest(lowest) cell index value up to the fifth value.

Here, the fourth predefined value may be a value defined by thespecification or the like, and may be known between the base stationdevice 3 and the terminal device 1. For example, the fourthpredetermined value may be a value such as “5” or “10”. For the TDD, thefirst predetermined value may be “5”. For example, for the FDD, thefirst predetermined value may be “10”. For example, for the TDD and theFDD, the first predetermined value may be “5”.

Furthermore, in the processing for each serving cell, the HARQ-ACK bitsequence may be concatenated based on the downlink transmission mode.For example, when a downlink transmission mode that supports onetransport block is configured for a particular cell, a 1-bit HARQ-ACKbit may be concatenated. Also, when a downlink transmission mode thatsupports two transport blocks is configured for a particular cell, a2-bit HARQ-ACK bits may be concatenated.

That is, the terminal device 1 may use the fourth PUCCH format totransmit a HARQ-ACK bit sequence (or a HARQ-ACK) provided based on theprocessing illustrated in FIG. 7.

FIG. 8 is a diagram illustrating a method to process uplink controlinformation according to the present embodiment. Here, FIG. 8illustrates a processing method to be used when the uplink controlinformation (e.g., HARQ-ACK) is transmitted using the fourth PUCCHformat.

As illustrated in FIG. 8, for example, the HARQ-ACK bit sequence, whichis a result of concatenating HARQ-ACK bits for different serving cells,may be composed by sequentially concatenating cell index values inascending order. Herein, the HARQ-ACK bit sequence may be formed byconcatenating up to a fifth predetermined value.

Here, the fifth predefined value may be a value defined by thespecification or the like, and may be known between the base stationdevice 3 and the terminal device 1. For example, the fifth predeterminedvalue may be “11”, “21”, or “22”. For example, for FDD or FDD-TDDprimary cell frame structure type 1, the fifth predetermined value maybe “11”. Also, for TDD, the third predetermined value may be “21”. Also,for FDD or FDD-TDD primary cell frame structure type 2, the thirdpredetermined value may be “22”.

In addition, the fifth predetermined value may be “12”, “22”, or “23”.For example, for FDD or FDD-TDD primary cell frame structure type 1, thethird predetermined value may be “12”. Also, for TDD, the thirdpredetermined value may be “22”. Also, for FDD or FDD-TDD primary cellframe structure type 2, the third predetermined value may be “23”.

That is, the fifth predetermined value may correspond to the thirdpredetermined value. For example, the fifth predetermined value may bethe third predetermined value plus 1. Herein, the third predeterminedvalue is as described above.

Furthermore, in the processing for each serving cell, the HARQ-ACK bitsequence may be concatenated based on the downlink transmission mode.For example, when a downlink transmission mode that supports onetransport block is configured for a particular cell, a 1-bit HARQ-ACKbit may be concatenated. Also, when a downlink transmission mode thatsupports two transport blocks is configured for a particular cell, a2-bit HARQ-ACK bits may be concatenated.

Herein, in a case where the terminal device 1 does not detect PDSCH orPDCCH instructing release of a downlink SPS (Semi-Persistent Scheduling)in a particular subframe for a particular serving cell (i.e., in a casethat neither PDSCH nor PDCCH is detected), a NACK may be generated forthe particular serving cell. For example, the terminal device 1 maygenerate a single NACK for serving cells for which a downlinktransmission mode supporting one transport block is configured, and twoNACKs may be generated for serving cells for which a downlinktransmission mode supporting up to two transport blocks is configured.

That is, the terminal device 1 may use the fourth PUCCH format totransmit a HARQ-ACK bit sequence (or a HARQ-ACK) provided based on theprocessing illustrated in FIG. 8.

FIG. 9 is a diagram illustrating a method for allocating PUCCH resourcesaccording to the present embodiment.

Here, the base station device 3 may instruct (configure, allocate) aPUCCH resource for the terminal device 3. Here, the PUCCH resource mayinclude a first PUCCH resource (also referred to as n(1)PUCCH), a secondPUCCH resource (also referred to as n(2)PUCCH), a third PUCCH resource(also referred to as n(3)PUCCH), and a fourth PUCCH resource (alsoreferred to as n(4)PUCCH).

For example, the base station device 3 may transmit the higher layersignaling including first information to be used to configure the firstPUCCH resource. For example, SR may be transmitted with the first PUCCHresource. The base station device 3 may transmit the higher layersignaling including second information to be used to indicateperiodicity and/or offset for transmission of SR. The terminal device 1may transmit SR in accordance with a configuration made by the basestation device 3. To be more specific, the terminal device 1 maytransmit SR using the first PUCCH resource and the first PUCCH format.

The base station device 3 may indicate the first PUCCH resource throughthe higher layer signaling and the PDCCH. For example, the base stationdevice 3 may transmit the higher layer signaling including thirdinformation to be used to configure the first PUCCH resource. Forexample, HARQ-ACK corresponding to the second PUCCH format may betransmitted with the first PUCCH resource. The terminal device 1 maydetermine the first PUCCH resource on the basis of the control channelelement (CCE) used for the transmission of the PDCCH (e.g., the lowestindex of the CCE) and the third information. The terminal device 1 mayuse the first PUCCH resource for the transmission of HARQ-ACKcorresponding to the second PUCCH format. To be more specific, theterminal device 1 may transmit HARQ-ACK using the first PUCCH resourceand/or the second PUCCH format.

The base station device 3 may transmit the higher layer signalingincluding fourth information to be used to configure the second PUCCHresource. For example, CSI (e.g., periodic CSI) may be transmitted withthe second PUCCH resource. Here, the second PUCCH resource may beconfigured for each of the serving cells. In other words, CSI (e.g.,CSI) may be reported for each of the serving cells. The base stationdevice 3 may transmit the higher layer signaling including fifthinformation to be used to indicate periodicity and/or offset for aperiodic CSI report. The terminal device 1 may periodically report CSIin accordance with a configuration made by the base station device 3. Tobe more specific, the terminal device 1 may report periodic CSI usingthe second PUCCH resource and/or the third PUCCH format.

The base station device 3 may indicate the third PUCCH resource throughthe higher layer signaling and the PDCCH (or downlink controlinformation transmitted on the PDCCH). For example, the base stationdevice 3 may use a higher layer signaling to transmit a set of sixthinformation for setting a plurality of values related to the third PUCCHresource, and may indicate the third resource by indicating one value ofthe plurality of values based on the value (also referred to as 1^(st)ARI; 1^(st) ACK Resource Indicator) set in the field of the downlinkcontrol information transmitted on the PDCCH.

For example, the base station device 3 may use the higher layersignaling to transmit the set of the sixth information for configuringfour values corresponding to the four third PUCCH resources Further, byindicating one value out of the four values based on the value (e.g.,the “00”, “01”, “10”, “11” set in the 2 bit field of information) set inthe field of the downlink control information transmitted on the PDCCH,the base station device 3 may indicate one of the third resourcescorresponding to the indicated value. That is, based on one valuecorresponding to the value set in the field of the downlink controlinformation from among the four values corresponding to the four thirdPUCCH resources, the terminal device 1 may determine one of the thirdPUCCH resources that corresponds to the indicated value.

For example, the base station device 3 may indicate a third PUCCHresource based on a value set in a transmit power command field(hereafter, also referred to as a TPC command field) for the PUCCHincluded in a downlink assignment transmitted on the PDCCH for asecondary cell. That is, based on the value set in the TPC command fieldincluded in the downlink assignment used to instruct PDSCH transmissionon the secondary cell, a single value corresponding to one of the singlethird PUCCH resources may be indicated.

Herein, the TPC command field included in the downlink assignment forthe primary cell (that is, the downlink assignment used for instructingPDSCH transmission on the primary cell) may be used as a transmit powercommand for transmission on the PUCCH. Also, the TPC command fieldincluded in the downlink assignment for the PUCCH secondary cell (thatis, the downlink assignment used for instructing PDSCH transmission inPUCCH secondary cell) may be used as a transmit power command fortransmission on the PUCCH.

Here, the base station device 3 may indicate a third PUCCH resourcebased on the value set in the TPC command field included in the downlinkassignment for a secondary cell with a cell index value smaller than orequal to the first predetermined value (or a secondary cell with a cellindex less than the second predetermined value).

That is, one value corresponding to one of the third PUCCH resources maybe indicated based on the value set in the TPC command field included inthe downlink assignment to be used to instruct PDSCH transmission on asecondary cell with a cell index value smaller than or equal to thefirst predetermined value (or a secondary cell with a cell index with avalue smaller than the second predetermined value).

In other words, a first ARI used to indicate the third PUCCH resourcemay be included in the downlink assignment(s) for the secondary cell(s)with a cell index value smaller than or equal to the first predeterminedvalue (or the secondary cell(s) with a cell index value smaller than thesecond predetermined value).

Herein, in the case where a plurality of PDSCH transmissions on aplurality of secondary cells with cell index values less than or equalto the first predetermined value (or a plurality of secondary cells withcell index values less than the second predetermined value) isinstructed using a plurality of downlink assignments in a particularsubframe, the base station device 3 may set the same value as the valueof the first ARI.

Also, in the case where a plurality of PDSCH transmissions in aplurality of secondary cells with cell index values less than or equalto the first predetermined value (or a plurality of secondary cells withcell index values less than the second predetermined value) isinstructed using a plurality of downlink assignments in a particularsubframe, it may be assumed that the same value is set as the value ofthe first ARI for the terminal device 1.

That is, the same value corresponding to one of the third PUCCHresources may be transmitted (it may be assumed that it is transmitted)in a particular subframe in each of the downlink assignments forsecondary cells with cell index values less than or equal to the firstpredetermined value (or secondary cells with cell index values less thanthe second predetermined value).

That is, the value for the same third PUCCH resource may be transmitted(it may be assumed that it is transmitted) in a particular subframe ineach of the downlink assignments for secondary cells with cell indexvalues less than or equal to the first predetermined value (or secondarycells with cell index values less than the second predetermined value).

For example, as described above, in the case where values of “1”, “3”,“4”, “6”, “10”, “12”, “15”, and “31” are set as cell indices for each ofthe eight secondary cells by the base station device 3, the firstpredetermined value may be “6”. Also, the second predetermined value maybe “10”.

That is, in the case where values of “1”, “3”, “4”, “6”, “10”, “12”,“15”, and “31” are configured as cell indices for each of the eightsecondary cells, the terminal device 1 may determine the third PUCCHresource based on the value set in the TPC command field included in thedownlink assignment(s) for the secondary cell(s) with cell index valuesof less than or equal to “6”. Also, in this case, the terminal device 1may determine the third PUCCH resources based on the value set in theTPC command field included in the downlink assignment(s) for thesecondary cell(s) with cell index values less than “10”.

In addition, in this case, the same value may be set to each of the TPCcommand fields included in the plurality of downlink assignments for theplurality of secondary cells with cell index values of less than orequal to “6” transmitted in a particular subframe. Furthermore, the samevalue may be set to each of the TPC command fields included in theplurality of downlink assignments for the plurality of secondary cellswith cell index values of less than “10” in a particular subframe.

The base station device 3 may configure the fourth PUCCH resourcethrough the higher layer signaling and/or the PDCCH (or downlink controlinformation transmitted on the PDCCH). For example, the base stationdevice 3 may transmit the higher layer signaling including seventhinformation to be used to configure the fourth PUCCH resource. The basestation device 3 may indicate the fourth PUCCH resource in associationwith the PDCCH. The terminal device 1 may determine the fourth PUCCHresource in accordance with the PDCCH. The base station device 3 maytransmit, on the PDCCH, downlink control information to be used toindicate the fourth PUCCH resource.

For example, the base station device 3 may configure the fourth PUCCHresource through the higher layer signaling and the PDCCH (or downlinkcontrol information transmitted on the PDCCH). For example, the basestation device 3 may use the higher layer signaling to transmit a set ofeighth information for configuring a plurality of values related to thefourth PUCCH resource, and may indicate the fourth resource bydesignating one value of the plurality of values based on the value(also referred to as 2^(nd) ARI; 2^(nd) ACK Resource Indicator) set inthe field of the downlink control information transmitted on the PDCCH.

For example, the base station device 3 may use the higher layersignaling to transmit the set of the eighth information for configuringfour values corresponding to the four fourth PUCCH resources. Further,by indicating one value out of the four values based on the value (e.g.,the “00”, “01”, “10”, “11” set in the 2 bit field of information) set inthe field of the downlink control information transmitted on the PDCCH,the base station device 3 may indicate one of the fourth resourcescorresponding to the indicated value. That is, based on one valuecorresponding to the value set in the field of the downlink controlinformation from among the four values corresponding to the four fourthPUCCH resources, the terminal device 1 may determine one of the fourthPUCCH resources that corresponds to the indicated value.

For example, the base station device 3 may indicate one of the fourthPUCCH resources based on the value set in the TPC command field includedin the downlink assignment transmitted on the PDCCH for the secondarycell. That is, a value corresponding to one of the fourth PUCCHresources may be indicated based on the value set in the TPC commandfield included in the downlink assignment to be used to instruct PDSCHtransmission on the secondary cell.

Here, the base station device 3 may indicate the fourth PUCCH resourcebased on the value set in the TPC command field(s) included in thedownlink assignment(s) for the secondary cell(s) with a cell index valuegreater than the first predetermined value (or the secondary cell(s)with a cell index less than or equal to the second predetermined value).

That is, one value corresponding to one of fourth PUCCH resources may beindicated based on the value set in the TPC command field(s) included inthe downlink assignment(s) to be used to instruct PDSCH transmission(s)on the secondary cell(s) with a cell index value greater than the firstpredetermined value (or the secondary cell(s) with a cell index with avalue smaller than or equal to the second predetermined value).

In other words, a second ARI used to indicate the fourth PUCCH resourcemay be included in the downlink assignment(s) for the secondary cell(s)with a cell index value greater than the first predetermined value (orthe secondary cell(s) with a cell index value smaller than or equal tothe second predetermined value).

Herein, in the case where a plurality of PDSCH transmissions in aplurality of secondary cells with cell index values greater than thefirst predetermined value (or a plurality of secondary cells with cellindex values less than or equal to the second predetermined value) isinstructed using a plurality of downlink assignments in a particularsubframe, the base station device 3 may set the same value as the valueof the second ARI.

Also, in the case where a plurality of PDSCH transmissions in aplurality of secondary cells with cell index values greater than thefirst predetermined value (or a plurality of secondary cells with cellindex values greater than or equal to the second predetermined value) isinstructed using a plurality of downlink assignments in a particularsubframe, it may be assumed that the same value is set as the value ofthe second ARI for the terminal device 1.

That is, the same value corresponding to one of the fourth PUCCHresources may be transmitted (it may be assumed that it is transmitted)in a particular subframe in each of the downlink assignments forsecondary cells with cell index values greater than the firstpredetermined value (or secondary cells with cell index values greaterthan or equal to the second predetermined value).

That is, the value corresponding to the same fourth PUCCH resource maybe transmitted (it may be assumed that it is transmitted) in aparticular subframe in each of the downlink assignments for secondarycells with cell index values greater than the first predetermined value(or secondary cells with cell index values greater than or equal to thesecond predetermined value).

For example, as described above, in the case where values of “1”, “3”,“4”, “6”, “10”, “12”, “15”, and “31” are configured as cell indices foreach of the eight secondary cells by the base station device 3, thefirst predetermined value may be “6”. Also, the second predeterminedvalue may be “10”.

That is, in the case where values of “1”, “3”, “4”, “6”, “10”, “12”,“15”, and “31” are configured as cell indices for each of the eightsecondary cells, the terminal device 1 may determine the fourth PUCCHresource based on the value set in the TPC command field(s) included inthe downlink assignment(s) for the secondary cell(s) with cell indexvalues greater than “6”. Further, in this case, the terminal device 1may determine the fourth PUCCH resource based on the value set in theTPC command field(s) included in the downlink assignment(s) for thesecondary cell(s) with cell index values less than or equal to “10”.

In addition, in this case, the same value may be set to each of the TPCcommand fields included in the plurality of downlink assignments for theplurality of secondary cells with cell index values greater than “6”transmitted in a particular subframe. Furthermore, the same value may beset to each of the TPC command fields included in the plurality ofdownlink assignments for the plurality of secondary cells with cellindex values of less than “10” in a particular subframe.

Here, as described above, the base station device 3 may configure theterminal device 1 to perform either the first behavior or the secondbehavior. For example, when the base station device 3 configures thefirst behavior for the terminal device 1, the first ARI and the secondARI may be transmitted as described above. Also, when the base stationdevice 3 configures the second behavior for the terminal device 1, onlythe second ARI may be transmitted.

The base station device 3 may, when configuring to perform the firstbehavior for the terminal device 1, indicate a third PUCCH resourcebased on the value set in the TPC command field(s) included in thedownlink assignment(s) for the secondary cell(s) with cell index valuesless than or equal to the first predetermined value, and indicate thefourth PUCCH resource based on the value set in the TPC command field(s)included in the downlink assignment(s) for the secondary cell(s) withcell index values greater than the first predetermined value.

That is, the base station device 3 may, when configuring to perform thefirst behavior for the terminal device 1, indicate the third PUCCHresource based on the value set in the TPC command field(s) included inthe downlink assignment(s) for the secondary cell(s) with cell indexvalues less than the second predetermined value, and indicate the fourthPUCCH resource based on the value set in the TPC command field(s)included in the downlink assignment(s) for the secondary cell(s) withcell index values greater than or equal to the second predeterminedvalue.

Here, the base station device 3 may, when configuring to perform thesecond behavior for the terminal device 1, indicate the fourth PUCCHresource based on the value set in the TPC command field(s) included inthe downlink assignment(s) for the secondary cell(s) (the secondarycell(s) with a cell index value smaller than or equal to the firstpredetermined value or the secondary cell(s) with a cell index valuegreater than the first predetermined value).

The base station device 3 may, when configuring to perform the secondbehavior for the terminal device 1, indicate the fourth PUCCH resourcebased on both the value in the TPC command field(s) included in thedownlink assignment(s) for the secondary cell(s) with cell index valuesless than or equal to the first predetermined value and the value in theTPC command field(s) included in the downlink assignment(s) for thesecondary cell(s) with cell index values greater than the firstpredetermined value.

The base station device 3 may, when configuring to perform the secondbehavior for the terminal device 1, indicate the fourth PUCCH resourcebased on both the value in the TPC command field(s) included in thedownlink assignment(s) for the secondary cell(s) with cell index valuesless than the second predetermined value and the value in the TPCcommand field(s) included in the downlink assignment(s) for thesecondary cell(s) with cell index values greater than or equal to thesecond predetermined value.

In the case where, when configuring to perform the second behavior forthe terminal device 1, a plurality of PDSCH transmissions in one or moresecondary cells with cell index values less than or equal to the firstpredetermined value and/or secondary cells with cell index valuesgreater than the first predetermined value is instructed using aplurality of downlink assignments in a particular subframe, the basestation device 3 may set the same value as the value of the second ARI.

In the case where, when configuring to perform the second behavior forthe terminal device 1, a plurality of PDSCH transmissions in one or moresecondary cells with cell index values less than the secondpredetermined value and/or secondary cells with cell index valuesgreater than or equal to the second predetermined value is instructedusing a plurality of downlink assignments in a particular subframe, thebase station device 3 may set the same value as the value of the secondARI.

Also, in the case where, a plurality of PDSCH transmissions in one ormore secondary cells with cell index values less than or equal to thefirst predetermined value and/or secondary cells with cell index valuesgreater than the first predetermined value is instructed using aplurality of downlink assignments in a particular subframe, it may beassumed that the same value is set as the value of the second ARI forthe terminal device 1 configured for the second operation.

In the case where a plurality of PDSCH transmissions in one or moresecondary cells with cell index values less than the secondpredetermined value and/or secondary cells with cell index valuesgreater than or equal to the second predetermined value is instructedusing a plurality of downlink assignments in a particular subframe, itmay be assumed that the same value is set as the value of the second ARIfor the terminal device 1 configured for the second operation.

That is, the value for the same fourth PUCCH resource may be transmitted(it may be assumed that it is transmitted) in a particular subframe ineach of the downlink assignments for secondary cells with cell indexvalues less than or equal to the first predetermined value and/orsecondary cells with cell index values greater than the firstpredetermined value.

That is, the value corresponding to the same fourth PUCCH resource maybe transmitted (it may be assumed that it is transmitted) in aparticular subframe in each of the downlink assignments for secondarycells with cell index values less than the second predetermined and/orsecondary cells with cell index values greater than or equal to thesecond predetermined value.

In addition, the base station device 3 may transmit a set of ninthinformation, to be used to indicate the fourth PUCCH resource, includedin the above-described single command (or MAC control element) used toactivate or deactivate a serving cell. The base station device 3 maytransmit a second ARI, to be used to indicate the fourth PUCCH resource,included in the above-described single command (or MAC control element)used to activate or deactivate a serving cell. That is, for example, thebase station device 3 may indicate the fourth PUCCH resource through thesingle command used to activate or deactivate at least a PUCCH secondarycell.

The terminal device 1 may determine the fourth PUCCH resource inaccordance with the set of the ninth information (or the second ARI)included in the single command (or MAC control element) used to activateor deactivate a serving cell. Here, the terminal device 1 may transmit,on the PUSCH and/or the PUCCH, HARQ-ACK for downlink data (PDSCHtransmission) including the single command to be used to indicate thefourth PUCCH resource. For example, the terminal device 1 may transmitHARQ-ACK at least for downlink data (PDSCH transmission) including thesingle command to be used to activate or deactivate the PUCCH secondarycell. Here, the terminal device 1 does not need to transmit HARQ-ACK fordownlink data (PDSCH transmission) including a single command to be usedto activate or deactivate a secondary cell not including a PUCCHsecondary cell.

Simultaneous transmission of HARQ-ACK and CSI will be described below.

Here, as described above, the terminal device 1 may simultaneouslytransmit HARQ-ACK and CSI using the third PUCCH format, the fourth PUCCHformat, and/or the fifth PUCCH format. Here, for example, the basestation device 3 can transmit the higher layer signaling including tenthinformation used to allow simultaneous transmission of HARQ-ACK and CSI(simultaneousAckNackAndCQI). Here, the tenth information may be used toallow simultaneous transmission of HARQ-ACK and CSI in the third PUCCHformat.

The base station device 3 can transmit the higher layer signalingincluding eleventh information used to allow simultaneous transmissionof HARQ-ACK and CSI (simultaneousAckNackAndCQI-Format3) using the fourthPUCCH format. Also, the base station device 3 can transmit the higherlayer signaling including twelfth information used to allow simultaneoustransmission of HARQ-ACK and CSI (simultaneousAckNackAndCQI-Format4)using the fifth PUCCH format.

For example, the base station device 3 may transmit, to the terminaldevice 1, the tenth information, the eleventh information, and/or thetwelfth information for each of the PUCCH cell groups through the higherlayer signaling. Also, the terminal device 1 may receive, from the basestation device 3, the tenth information, the eleventh information,and/or the twelfth information for each of the PUCCH cell groups throughthe higher layer signaling.

In addition, the base station device 3 may transmit, to the terminaldevice 1, information common to multiple PUCCH cell groups (the tenthinformation, the eleventh information, and/or the twelfth information)through the higher layer signaling. Also, the terminal device 1 mayreceive, from the base station device 3, information common to multiplePUCCH cell groups (the tenth information, the eleventh information,and/or the twelfth information) through the higher layer signaling.

The base station device 3 may transmit, to the terminal device 1, thetenth information, the eleventh information, and/or the twelfthinformation for each of the PUCCH serving cells through the higher layersignaling. The terminal device 1 may receive, from the base stationdevice 3, the tenth information, the eleventh information, and/or thetwelfth information for each of the PUCCH serving cells through thehigher layer signaling.

Also, the base station device 3 may transmit, to the terminal device 1,information common to multiple PUCCH serving cells (the tenthinformation, the eleventh information, and/or the twelfth information)through the higher layer signaling. In addition, the terminal device 1may receive, from the base station device 3, information common tomultiple PUCCH serving cells (the tenth information, the eleventhinformation, and/or the twelfth information) through the higher layersignaling.

The base station device 3 may transmit, to the terminal device 1, thetenth information, the eleventh information, and/or the twelfthinformation for each of the master cell group and the secondary cellgroup through the higher layer signaling. Also, the terminal device 1may receive, from the base station device 3, the tenth information, theeleventh information, and/or the twelfth information for each of themaster cell group and the secondary cell group through the higher layersignaling.

Hereinafter, the behavior of the terminal device 1 in the case where theHARQ-ACK collides with the CSI report (e.g., periodic CSI) in the samesubframe without any PUSCH will be described.

For example, based on the condition that simultaneous transmission ofthe HARQ-ACK and CSI is allowed on the basis of the tenth information,the terminal device 1 may report the CSI multiplexed with the HARQ-ACKon the PUCCH using the third PUCCH format. Here, HARQ-ACK and CSI may betransmitted simultaneously with the second PUCCH resource. Also in thiscase, one serving cell may be configured for the terminal device 1.

Further, based on the conditions that simultaneous transmission of theHARQ-ACK and CSI is allowed on the basis of the tenth information andthat the HARQ-ACK corresponds to PDSCH transmission only on the primarycell, the terminal device 1 may report the CSI multiplexed with theHARQ-ACK on the PUCCH using the third PUCCH format. Here, HARQ-ACK andCSI may be transmitted simultaneously with the second PUCCH resource.Also in this case, more than one serving cell may be configured for theterminal device 1.

Also, based on the conditions that simultaneous transmission of theHARQ-ACK and CSI is allowed on the basis of the tenth information andthat the HARQ-ACK corresponds to PDSCH transmission only on the PUCCHsecondary cell, the terminal device 1 may report the CSI multiplexedwith the HARQ-ACK on the PUCCH using the third PUCCH format. Here,HARQ-ACK and CSI may be transmitted simultaneously with the second PUCCHresource. Also in this case, more than one serving cell may beconfigured for the terminal device 1.

Here, in order to transmit the HARQ-ACK and CSI for PDSCH transmissiononly on the PUCCH secondary cell, the terminal device 1 may use a secondPUCCH resource (hereafter, also referred to as a 2-1 PUCCH resource)configured by the higher layer. For example, the base station device 3may transmit the higher layer signaling that includes information usedto configure the 2-1 PUCCH resource.

To be more specific, the terminal device 1 may transmit HARQ-ACK and CSIfor PDSCH transmission only on the PUCCH secondary cell, with a secondPUCCH resource (the 2-1 PUCCH resource) different from the second PUCCHresource used for the transmission of HARQ-ACK and CSI for PDSCHtransmission only on the primary cell.

Here, for example, the second PUCCH resource (the 2-1 PUCCH resource)different from the second PUCCH resource may refer to a PUCCH resourcedesignated (configured) with a resource index different from theresource index of the second PUCCH resource. In addition, the secondPUCCH resource (the 2-1 PUCCH resource) that differs from the secondPUCCH resource may refer to a PUCCH resource designated (set) with anorthogonal sequence index different from the orthogonal sequence indexfor the second PUCCH resource. Also, the second PUCCH resource (the 2-1PUCCH resource) that differs from the second PUCCH resource may refer toa PUCCH resource designated (set) with a cyclic shift value differentfrom the cyclic shift for the second PUCCH resource.

Also, based on the conditions that simultaneous transmission of theHARQ-ACK and CSI is allowed on the basis of the eleventh information andthat the HARQ-ACK corresponds to PDSCH transmission only on the PUCCHsecondary cell, the terminal device 1 may report the CSI multiplexedwith the HARQ-ACK on the PUCCH using the fourth PUCCH format. Here,HARQ-ACK and CSI may be transmitted simultaneously with the third PUCCHresource. Also in this case, more than one serving cell may beconfigured for the terminal device 1. Also in this case, more than fiveserving cells may be configured for the terminal device 1. Also, in thiscase, the fourth PUCCH format may be configured for the terminal device1.

Also, based on the conditions that simultaneous transmission of theHARQ-ACK and CSI is allowed on the basis of the twelfth information andthat the HARQ-ACK corresponds to PDSCH transmission only on the PUCCHsecondary cell, the terminal device 1 may report the CSI multiplexedwith the HARQ-ACK on the PUCCH using the fifth PUCCH format. Here,HARQ-ACK and CSI may be transmitted simultaneously with the fourth PUCCHresource. Also in this case, more than one serving cell may beconfigured for the terminal device 1. Also in this case, more than fiveserving cells may be configured for the terminal device 1. Also, in thiscase, the fifth PUCCH format may be configured for the terminal device1.

Further, based on the conditions that simultaneous transmission of theHARQ-ACK and CSI is allowed on the basis of the eleventh information andthat the HARQ-ACK corresponds to PDSCH transmission on the secondarycell, the terminal device 1 may report the CSI multiplexed with theHARQ-ACK on the PUCCH using the fourth PUCCH format. In this case, morethan one serving cell may be configured for the terminal device 1. Alsoin this case, more than five serving cells may be configured for theterminal device 1. Also, in this case, the fourth PUCCH format may beconfigured for the terminal device 1.

For example, in this case, the terminal device 1 may report CSImultiplexed with HARQ-ACK on the PUCCH using the fourth PUCCH formatunder the condition that the total number of bits corresponding to theuplink control information (HARQ-ACK, SR, and/or CSI) in the subframe isnot greater than or equal to a predetermined value (e.g., 22 bits).Here, HARQ-ACK and CSI may be transmitted simultaneously with the thirdPUCCH resource.

Further, based on the conditions that simultaneous transmission of theHARQ-ACK and CSI is allowed on the basis of the twelfth information andthat the HARQ-ACK corresponds to PDSCH transmission on the secondarycell, the terminal device 1 may report the CSI multiplexed with theHARQ-ACK on the PUCCH using the fifth PUCCH format. In this case, morethan one serving cell may be configured for the terminal device 1. Alsoin this case, more than five serving cells may be configured for theterminal device 1. Also, in this case, the fifth PUCCH format may beconfigured for the terminal device 1.

For example, in this case, the terminal device 1 may report CSImultiplexed with HARQ-ACK on the PUCCH using the fifth PUCCH formatunder the condition that the total number of bits corresponding to theuplink control information in the subframe is not greater than or equalto a predetermined value (e.g., the number of bits transmitted in thefifth PUCCH format). Here, HARQ-ACK and CSI may be transmittedsimultaneously with the fourth PUCCH resource.

Here, based at least on the conditions that simultaneous transmission ofthe HARQ-ACK and the CSI is allowed and that the HARQ-ACK corresponds toPDSCH transmission(s) on the secondary cell(s) with a cell index valuesmaller than or equal to the first predetermined value, the terminaldevice 1 may report the CSI multiplexed with the HARQ-ACK using thefourth PUCCH format. Here, HARQ-ACK and CSI may be transmittedsimultaneously with the third PUCCH resource.

That is, based at least on the conditions that simultaneous transmissionof the HARQ-ACK and the CSI is allowed and that the HARQ-ACK correspondsto PDSCH transmission(s) on the secondary cell(s) with a cell indexvalue smaller than the second predetermined value, the terminal device 1may report the CSI multiplexed with the HARQ-ACK using the fourth PUCCHformat. Here, HARQ-ACK and CSI may be transmitted simultaneously withthe third PUCCH resource.

In this case, more than one serving cell may be configured for theterminal device 1. Also in this case, more than five serving cells maybe configured for the terminal device 1. In addition, in this case,simultaneous transmission of HARQ-ACK and CSI may be allowed based onthe eleventh information and/or the twelfth information. Note that thisonly applies in the case where simultaneous transmission of HARQ-ACK andCSI is allowed based on both the eleventh information and the twelfthinformation. In other words, in the case where simultaneous transmissionof the HARQ-ACK and CSI is allowed based on the twelfth information, butsimultaneous transmission of the HARQ-ACK and CSI is not allowed basedon the eleventh information, the CSI multiplexed with the HARQ-ACK onthe PUCCH may always be reported using the fifth PUCCH format.

Also, in this case, the fourth PUCCH format may be configured for theterminal device 1. Also in this case, the fifth PUCCH format may beconfigured for the terminal device 1. Note that this only applies in thecase where both the fourth PUCCH format and the fifth PUCCH format areconfigured. In other words, in the case where the fifth PUCCH format isset, but the fourth PUCCH format is not set, the CSI multiplexed withthe HARQ-ACK on the PUCCH may always be reported using the fifth PUCCHformat.

In addition, based at least on the conditions that simultaneoustransmission of the HARQ-ACK and the CSI is allowed and that theHARQ-ACK corresponds to PDSCH transmission(s) on the secondary cell(s)with a cell index greater than the first predetermined value, theterminal device 1 may report the CSI multiplexed with the HARQ-ACK usingthe fifth PUCCH format. Here, HARQ-ACK and CSI may be transmittedsimultaneously with the fourth PUCCH resource.

That is, based at least on the conditions that simultaneous transmissionof the HARQ-ACK and the CSI is allowed and that the HARQ-ACK correspondsto PDSCH transmission(s) on the secondary cell(s) with a cell index lessthan or equal to the second predetermined value, the terminal device 1may report the CSI multiplexed with the HARQ-ACK using the fifth PUCCHformat. Here, HARQ-ACK and CSI may be transmitted simultaneously withthe fourth PUCCH resource.

In this case, more than one serving cell may be configured for theterminal device 1.

Also in this case, more than five serving cells may be configured forthe terminal device 1. Also, in this case, simultaneous transmission ofthe HARQ-ACK and the CSI may be allowed based on the twelfthinformation. Also, in this case, the fifth PUCCH format may beconfigured for the terminal device 1.

Herein, in cases in which the above described conditions are notsatisfied, the CSI may be dropped and the HARQ-ACK may be transmittedalone. That is, based on at least one of the tenth information, theeleventh information, the twelfth information, and/or the abovedescribed conditions, the terminal device 1 may drop the CSI andtransmit only the HARQ-ACK.

With respect to the present embodiment, although an example in whichvalues of “1”, “3”, “4”, “6”, “10”, “12”, “15”, and “31” are set as cellindices for each of the eight secondary cells was described, the abovedescription may be applied to other configurations as well.

Embodiments of the present invention relating to a method and processingoperations for transmission of uplink control information have beendescribed in detail above with reference to the drawings, but specificconfigurations are not limited to the above embodiments and may include,for example, modifications to the above design that fall within thescope that does not depart from the spirit of the present invention.Furthermore, with respect to the present embodiment, embodimentsobtained by suitably combining the above-described methods and processesare also included in the technical scope of the present invention.

Configurations of devices according to the present embodiment will bedescribed below.

FIG. 10 is a schematic block diagram illustrating a configuration of aterminal device 1 according to the present embodiment. As illustrated inthe figure, the terminal device 1 is configured, including a higherlayer processing unit 101, a control unit 103, a reception unit 105, atransmission unit 107, and a transmit and receive antenna 109. Thehigher layer processing unit 101 is configured, including a radioresource control unit 1011, a scheduling information interpretation unit1013, and a transmit power control unit 1015. The reception unit 105 isconfigured, including a decoding unit 1051, a demodulation unit 1053, ademultiplexing unit 1055, a radio reception unit 1057, and a channelmeasurement unit 1059. The transmission unit 107 is configured,including a coding unit 1071, a modulation unit 1073, a multiplexingunit 1075, a radio transmission unit 1077, and an uplink referencesignal generation unit 1079.

The higher layer processing unit 101 outputs the uplink data (thetransport block) generated by a user operation or the like, to thetransmission unit 107. Also, the higher layer processing unit 101 mayperform processing of the medium access control (MAC) layer, the packetdata convergence protocol (PDCP) layer, the radio link control (RLC)layer, and the radio resource control (RRC) layer.

The radio resource control unit 1011 included in the higher layerprocessing unit 101 manages various configuration information/parametersof the terminal device 1 itself. The radio resource control unit 1011sets the various configuration information/parameters in accordance withhigher layer signaling received from the base station device 3. To bemore specific, the radio resource control unit 1011 sets the variousconfiguration information/parameters in accordance with the informationindicating the various configuration information/parameters receivedfrom the base station device 3. Furthermore, the radio resource controlunit 1011 generates information to be mapped to each uplink channel, andoutputs the generated information to the transmission unit 107. Theradio resource control unit 1011 is also referred to as a configurationunit 1011.

Here, the scheduling information interpretation unit 1013 included inthe higher layer processing unit 101 interprets the DCI format(scheduling information) received through the reception unit 105,generates control information for control of the reception unit 105 andthe transmission unit 107, in accordance with a result of interpretingthe DCI format, and outputs the generated control information to thecontrol unit 103.

The transmit power control unit 1015 included in the higher layerprocessing unit 101 controls the transmit power for transmission on thePUSCH and the PUCCH in accordance with various configurationinformation/parameters managed by the radio resource control unit 1011,a TPC command, and the like.

In accordance with the control information originating from the higherlayer processing unit 101, the control unit 103 generates a controlsignal for control of the reception unit 105 and the transmission unit107. The control unit 103 outputs the generated control signal to thereception unit 105 and the transmission unit 107 to control thereception unit 105 and the transmission unit 107.

In accordance with the control signal input from the control unit 103,the reception unit 105 demultiplexes, demodulates, and decodes areception signal received from the base station device 3 through thetransmit and receive antenna 109, and outputs the information resultingfrom the decoding, to the higher layer processing unit 101.

The radio reception unit 1057 converts (down-converts) a downlink signalreceived through the transmit and receive antenna 109 into a basebandsignal through orthogonal demodulation, removes unnecessary frequencycomponents, controls an amplification level in such a manner as tosuitably maintain a signal level, performs orthogonal demodulation onthe basis of an in-phase component and an orthogonal component of thereceived signal, and converts the resulting orthogonally-demodulatedanalog signal into a digital signal. The radio reception unit 1057removes a portion corresponding to a cyclic prefix (CP) from the digitalsignal resulting from the conversion, performs fast Fourier transform(FFT) on the signal from which the CP has been removed, and extracts asignal in the frequency domain.

The demultiplexing unit 1055 demultiplexes the extracted signal into thePHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink referencesignal. Moreover, the demultiplexing unit 1055 makes a compensation ofchannels including the PHICH, the PDCCH, the EPDCCH, and the PDSCH, froma channel estimate input from the channel measurement unit 1059.Furthermore, the demultiplexing unit 1055 outputs the downlink referencesignal resulting from the demultiplexing, to the channel measurementunit 1059.

The demodulation unit 1053 multiplies the PHICH by a corresponding codefor composition, demodulates the resulting composite signal incompliance with a binary phase shift keying (BPSK) modulation scheme,and outputs a result of the demodulation to the decoding unit 1051. Thedecoding unit 1051 decodes the PHICH destined for the terminal device 1itself and outputs the HARQ indicator resulting from the decoding to thehigher layer processing unit 101. The demodulation unit 1053 demodulatesthe PDCCH and/or the EPDCCH in compliance with a QPSK modulation schemeand outputs a result of the demodulation to the decoding unit 1051. Thedecoding unit 1051 attempts to decode the PDCCH and/or the EPDCCH. In acase of succeeding in the decoding, the decoding unit 1051 outputsdownlink control information resulting from the decoding and an RNTI towhich the downlink control information corresponds, to the higher layerprocessing unit 101.

The demodulation unit 1053 demodulates the PDSCH in compliance with amodulation scheme notified with the downlink grant, such as quadraturephase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), or64 QAM, and outputs a result of the demodulation to the decoding unit1051. The decoding unit 1051 decodes the data in accordance withinformation on a coding rate notified with the downlink controlinformation, and outputs, to the higher layer processing unit 101, thedownlink data (the transport block) resulting from the decoding.

The channel measurement unit 1059 measures a downlink path loss or achannel state from the downlink reference signal input from thedemultiplexing unit 1055, and outputs the measured path loss or channelstate to the higher layer processing unit 101. Furthermore, the channelmeasurement unit 1059 calculates a downlink channel estimate from thedownlink reference signal and outputs the calculated downlink channelestimate to the demultiplexing unit 1055. The channel measurement unit1059 performs channel measurement and/or interference measurement inorder to calculate the CQI (or the CSI).

The transmission unit 107 generates the uplink reference signal inaccordance with the control signal input from the control unit 103,codes and modulates the uplink data (the transport block) input from thehigher layer processing unit 101, multiplexes the PUCCH, the PUSCH, andthe generated uplink reference signal, and transmits a result of themultiplexing to the base station device 3 through the transmit andreceive antenna 109. Furthermore, the transmission unit 107 transmitsuplink control information.

The coding unit 1071 performs coding, such as convolutional coding orblock coding, on the uplink control information input from the higherlayer processing unit 101. Furthermore, the coding unit 1071 performsturbo coding in accordance with information used for the scheduling ofthe PUSCH.

The modulation unit 1073 modulates coded bits input from the coding unit1071, in compliance with the modulation scheme notified with thedownlink control information, such as BPSK, QPSK, 16 QAM, or 64 QAM, orin compliance with a modulation scheme prescribed in advance for eachchannel. In accordance with the information used for the scheduling ofthe PUSCH, the modulation unit 1073 determines the number of datasequences to be spatial-multiplexed, maps multiple pieces of uplink datato be transmitted on the same PUSCH to multiple sequences throughmultiple input multiple output spatial multiplexing (MIMO SM), andperforms precoding on the sequences.

The uplink reference signal generation unit 1079 generates a sequenceacquired in accordance with a rule (formula) prescribed in advance, onthe basis of a physical layer cell identifier (also referred to as aphysical cell identity (PCI), a cell ID, or the like) for identifyingthe base station device 3, a bandwidth to which the uplink referencesignal is mapped, a cyclic shift notified with the uplink grant, aparameter value for generation of a DMRS sequence, and the like. Inaccordance with the control signal input from the control unit 103, themultiplexing unit 1075 may rearrange modulation symbols of the PUSCH inparallel and then perform discrete Fourier transform (DFT) on therearranged modulation symbols. Furthermore, the multiplexing unit 1075multiplexes PUCCH and PUSCH signals and the generated uplink referencesignal for each transmit antenna port. To be more specific, themultiplexing unit 1075 maps the PUCCH and PUSCH signals and thegenerated uplink reference signal to the resource elements for eachtransmit antenna port.

The radio transmission unit 1077 performs inverse fast Fourier transform(IFFT) on a signal resulting from the multiplexing, generates an SC-FDMAsymbol, attaches a CP to the generated SC-FDMA symbol, generates abaseband digital signal, converts the baseband digital signal into ananalog signal, removes unnecessary frequency components through alowpass filter, up-converts a result of the removal into a signal of acarrier frequency, performs power amplification, and outputs a finalresult to the transmit and receive antenna 109 for transmission.

FIG. 11 is a schematic block diagram illustrating a configuration of abase station device 3 according to the present embodiment. Asillustrated in the figure, the base station device 3 is configured,including a higher layer processing unit 301, a control unit 303, areception unit 305, a transmission unit 307, and a transmit and receiveantenna 309. The higher layer processing unit 301 is configured,including a radio resource control unit 3011, a scheduling unit 3013,and a transmit power control unit 3015. The reception unit 305 isconfigured, including a decoding unit 3051, a demodulation unit 3053, ademultiplexing unit 3055, a radio reception unit 3057, and a channelmeasurement unit 3059. The transmission unit 307 is configured,including a coding unit 3071, a modulation unit 3073, a multiplexingunit 3075, a radio transmission unit 3077, and a downlink referencesignal generation unit 3079.

The higher layer processing unit 301 performs processing of the mediumaccess control (MAC) layer, the packet data convergence protocol (PDCP)layer, the radio link control (RLC) layer, and the radio resourcecontrol (RRC) layer. Furthermore, the higher layer processing unit 301generates control information for control of the reception unit 305 andthe transmission unit 307, and outputs the generated control informationto the control unit 303.

The radio resource control unit 3011 included in the higher layerprocessing unit 301 generates, or acquires from a higher node, thedownlink data (the transport block) mapped to the downlink PDSCH, systeminformation, the RRC message, the MAC control element (CE), and thelike, and outputs a result of the generation or the acquirement to thetransmission unit 307. Furthermore, the radio resource control unit 3011manages various configuration information/parameters for each of theterminal devices 1. The radio resource control unit 3011 may configurevarious configuration information/parameters for each of the terminaldevices 1 through higher layer signaling. In other words, the radioresource control unit 1011 transmits/broadcasts information indicatingvarious configuration information/parameters. The radio resource controlunit 3011 is also referred to as a configuration unit 3011.

The scheduling unit 3013 included in the higher layer processing unit301 determines a frequency and a subframe to which the physical channels(the PDSCH and the PUSCH) are allocated, the coding rate and modulationscheme for the physical channels (the

PDSCH and the PUSCH), the transmit power, and the like, from thereceived channel state information and from the channel estimate,channel quality, or the like input from the channel measurement unit3059. The scheduling unit 3013 generates the control information (e.g.,the DCI format) in order to control the reception unit 305 and thetransmission unit 307 in accordance with a result of the scheduling, andoutputs the generated information to the control unit 303. Thescheduling unit 3013 further determines timing of performingtransmission processing and reception processing.

The transmit power control unit 3015 included in the higher layerprocessing unit 301 controls the transmit power for transmission on thePUSCH and the PUCCH performed by the terminal device 1, in accordancewith various configuration information/parameters managed by the radioresource control unit 3011, a TPC command, and the like.

In accordance with the control information originating from the higherlayer processing unit 301, the control unit 303 generates a controlsignal for control of the reception unit 305 and the transmission unit307. The control unit 303 outputs the generated control signal to thereception unit 305 and the transmission unit 307 to control thereception unit 305 and the transmission unit 307.

In accordance with the control signal input from the control unit 303,the reception unit 305 demultiplexes, demodulates, and decodes thereception signal received from the terminal device 1 through thetransmit and receive antenna 309, and outputs information resulting fromthe decoding to the higher layer processing unit 301. The radioreception unit 3057 converts (down-converts) an uplink signal receivedthrough the transmit and receive antenna 309 into a baseband signalthrough orthogonal demodulation, removes unnecessary frequencycomponents, controls the amplification level in such a manner as tosuitably maintain a signal level, performs orthogonal demodulation onthe basis of an in-phase component and an orthogonal component of thereceived signal, and converts the resulting orthogonally-demodulatedanalog signal into a digital signal. The reception unit 305 receivesuplink control information.

The radio reception unit 3057 removes a portion corresponding to acyclic prefix (CP) from the digital signal resulting from theconversion. The radio reception unit 3057 performs fast Fouriertransform (FFT) on the signal from which the CP has been removed,extracts a signal in the frequency domain, and outputs the resultingsignal to the demultiplexing unit 3055.

The demultiplexing unit 1055 demultiplexes the signal input from theradio reception unit 3057 into the PUCCH, the PUSCH, and the signal suchas the uplink reference signal. The demultiplexing is performed on thebasis of radio resource allocation information that is determined inadvance by the base station device 3 using the radio resource controlunit 3011 and that is included in the uplink grant notified to each ofthe terminal devices 1. Furthermore, the demultiplexing unit 3055 makesa compensation of channels including the PUCCH and the PUSCH from thechannel estimate input from the channel measurement unit 3059.Furthermore, the demultiplexing unit 3055 outputs an uplink referencesignal resulting from the demultiplexing, to the channel measurementunit 3059.

The demodulation unit 3053 performs inverse discrete Fourier transform(IDFT) on the PUSCH, acquires modulation symbols, and performs receptionsignal demodulation, that is, demodulates each of the modulation symbolson the PUCCH and the PUSCH, in compliance with the modulation schemeprescribed in advance, such as binary phase shift keying (BPSK), QPSK,16 QAM, or 64 QAM, or in compliance with the modulation scheme that thebase station device 3 itself notified in advance with the uplink grantto each of the terminal devices 1. The demodulation unit 3053demultiplexes the modulation symbols of multiple pieces of uplink datatransmitted on the same PUSCH with the MIMO SM, on the basis of thenumber of spatial-multiplexed sequences notified in advance with theuplink grant to each of the terminal devices 1 and informationdesignating the precoding to be performed on the sequences.

The decoding unit 3051 decodes the coded bits of the PUCCH and thePUSCH, which have been demodulated, at the coding rate in compliancewith a coding scheme prescribed in advance, the coding rate beingprescribed in advance or being notified in advance with the uplink grantto the terminal device 1 by the base station device 3 itself, andoutputs the decoded uplink data and uplink control information to thehigher layer processing unit 101. In a case where the PUSCH isre-transmitted, the decoding unit 3051 performs the decoding with thecoded bits input from the higher layer processing unit 301 and retainedin an HARQ buffer, and the demodulated coded bits. The channelmeasurement unit 309 measures the channel estimate, the channel quality,and the like, on the basis of the uplink reference signal input from thedemultiplexing unit 3055, and outputs a result of the measurement to thedemultiplexing unit 3055 and the higher layer processing unit 301.

The transmission unit 307 generates the downlink reference signal inaccordance with the control signal input from the control unit 303,codes and modulates the HARQ indicator, the downlink controlinformation, and the downlink data that are input from the higher layerprocessing unit 301, multiplexes the PHICH, the PDCCH, the EPDCCH, thePDSCH, and the downlink reference signal, and transmits a result of themultiplexing to the terminal device 1 through the transmit and receiveantenna 309.

The coding unit 3071 codes the HARQ indicator, the downlink controlinformation, and the downlink data that are input from the higher layerprocessing unit 301, in compliance with the coding scheme prescribed inadvance, such as block coding, convolutional coding, or turbo coding, orin compliance with the coding scheme determined by the radio resourcecontrol unit 3011. The modulation unit 3073 modulates the coded bitsinput from the coding unit 3071, in compliance with the modulationscheme prescribed in advance, such as BPSK, QPSK, 16 QAM, or 64 QAM, orin compliance with the modulation scheme determined by the radioresource control unit 3011.

The downlink reference signal generation unit 3079 generates, as thedownlink reference signal, a sequence that is already known to theterminal device 1 and that is acquired in accordance with a ruleprescribed in advance on the basis of the physical layer cell identifier(PCI) for identifying the base station device 3, and the like. Themultiplexing unit 3075 multiplexes the modulated modulation symbol ofeach channel and the generated downlink reference signal. To be morespecific, the multiplexing unit 3075 maps the modulated modulationsymbol of each channel and the generated downlink reference signal tothe resource elements.

The radio transmission unit 3077 performs inverse fast Fourier transform(IFFT) on the modulation symbol resulting from the multiplexing or thelike, generates an OFDM symbol, attaches a CP to the generated OFDMsymbol, generates a baseband digital signal, converts the basebanddigital signal into an analog signal, removes unnecessary frequencycomponents through a lowpass filter, up-converts a result of the removalinto a signal of a carrier frequency, performs power amplification, andoutputs a final result to the transmit and receive antenna 309 fortransmission.

More particularly, the terminal device 1 according to the presentembodiment may include a transmission unit 107 configured to transmit,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index less than or equal to a first predeterminedvalue, a HARQ-ACK using a first PUCCH resource and a PUCCH format 3, andtransmit, with respect to PDSCH transmission on a secondary cell on asecondary cell having a cell index greater than the first predeterminedvalue, a HARQ-ACK using a second PUCCH resource and a PUCCH format 4.

Herein, the first predetermined value may be a value of a fourth cellindex when values of a set of cell indices set by a base station deviceare arranged in ascending order, the first PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 3 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index less thanor equal to the first predetermined value, and the second PUCCH resourcefor transmission of the HARQ-ACK using the PUCCH format 4 may bedesignated based on at least a value set in an information fieldincluded in a downlink assignment for a secondary cell having a cellindex greater than the first predetermined value.

Also, the terminal device 1 according to the present embodiment, mayinclude a transmission unit configured to transmit, with respect toPDSCH transmission on a secondary cell on a secondary cell having a cellindex less than or equal to a first predetermined value, a HARQ-ACKusing a first PUCCH resource and a PUCCH format 3, and transmit, withrespect to PDSCH transmission on a secondary cell on a secondary cellhaving a cell index greater than the first predetermined value, aHARQ-ACK using a second PUCCH resource and a PUCCH format 4.

Herein, the first predetermined value may be a maximum cell index valuewith a bit sequence of 10 or less obtained by sequentially concatenatingHARQ-ACK bits corresponding to the primary cell up to HARQ-ACK bitscorresponding to a serving cell with a cell index of the firstpredetermined value, the first PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 3 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index less than or equal to the firstpredetermined value, and the second PUCCH resource for transmission ofthe HARQ-ACK using the PUCCH format 4 may be designated based on atleast a value set in an information field included in a downlinkassignment for a secondary cell having a cell index greater than thefirst predetermined value.

Also, the first PUCCH resource may be designated based on a value set inan information field included in a downlink assignment for a secondarycell with a cell index less than or equal to the first predeterminedvalue from four first PUCCH resources set by a higher layer, and thesecond PUCCH resource may be designated based on a value set in aninformation field included in a downlink assignment for a secondary cellwith a cell index greater than the first predetermined value from thefour second PUCCH resources set by the higher layer.

Also, a value designating an identical first PUCCH resource may be setfor each information field included in a plurality of downlinkassignments for a plurality of secondary cells with cell indices lessthan or equal to the first predetermined value in a particular subframe,and a value designating an identical second PUCCH resource may be setfor each information field included in a plurality of download links fora plurality of secondary cells with cell indices greater than the firstpredetermined value in a particular subframe.

In addition, the base station device 3 according to the presentembodiment may include a reception unit 305 configured to receive, withrespect to PDSCH transmission on a secondary cell on a secondary cellhaving a cell index less than or equal to a first predetermined value, aHARQ-ACK using a first PUCCH resource and a PUCCH format 3, and receive,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index greater than the first predetermined value, aHARQ-ACK using a second PUCCH resource and a PUCCH format 4.

Herein, the first predetermined value may be a value of a fourth cellindex when values of a set of cell indices set for a terminal device arearranged in ascending order, the first PUCCH resource for transmissionof the HARQ-ACK using the PUCCH format 3 may be designated based on atleast a value set in an information field included in a downlinkassignment for a secondary cell having a cell index less than or equalto the first predetermined value, and the second PUCCH resource fortransmission of the HARQ-ACK using the PUCCH format 4 may be designatedbased on at least a value set in an information field included in adownlink assignment for a secondary cell having a cell index greaterthan the first predetermined value.

In addition, the base station device 3 according to the presentembodiment may include a reception unit 305 configured to receive, withrespect to PDSCH transmission on a secondary cell on a secondary cellhaving a cell index less than or equal to a first predetermined value, aHARQ-ACK using a first PUCCH resource and a PUCCH format 3, and receive,with respect to PDSCH transmission on a secondary cell on a secondarycell having a cell index greater than the first predetermined value, aHARQ-ACK using a second PUCCH resource and a PUCCH format 4.

Herein, the first predetermined value may be a maximum cell index valuewith a bit sequence of 10 or less obtained by sequentially concatenatingHARQ-ACK bits corresponding to the primary cell up to HARQ-ACK bitscorresponding to a serving cell with a cell index for the firstpredetermined value, the first PUCCH resource for transmission of theHARQ-ACK using the PUCCH format 3 may be designated based on at least avalue set in an information field included in a downlink assignment fora secondary cell having a cell index less than or equal to the firstpredetermined value, and the second PUCCH resource for transmission ofthe HARQ-ACK using the PUCCH format 4 may be designated based on atleast a value set in an information field included in a downlinkassignment for a secondary cell having a cell index greater than thefirst predetermined value.

Also, the first PUCCH resource may be designated based on a value set inan information field included in a downlink assignment for a secondarycell with a cell index less than or equal to the first predeterminedvalue from four first PUCCH resources set by a higher layer, and thesecond PUCCH resource may be designated based on a value set in aninformation field included in a downlink assignment for a secondary cellwith a cell index greater than the first predetermined value from thefour second PUCCH resources set by the higher layer.

Also, a value designating an identical first PUCCH resource may be setfor each information field included in a plurality of downlinkassignments for a plurality of secondary cells with cell indices lessthan or equal to the first predetermined value in a particular subframe,and a value designating an identical second PUCCH resource may be setfor each information field included in a plurality of download links fora plurality of secondary cells with cell indices greater than the firstpredetermined value in a particular subframe.

In addition, the terminal device 1 of the present embodiment may includea reception unit 105 configured to receive both a first set ofinformation used for permitting simultaneous transmission of a CSI and aHARQ-ACK using PUCCH format 3, as well as a second set of informationused for permitting simultaneous transmission of a CSI and a HARQ-ACKusing PUCCH format 4. The terminal device 1 may also include atransmission unit 107 for transmitting a HARQ-ACK and/or a CSI, andwherein any of the following processing operations (1) to (4) areexecuted based at least on whether the first set of information, thesecond set of information, and the HARQ-ACK correspond to a PDSCHtransmission on a secondary cell with a cell index less than or equal toa first predetermined value or whether the HARQ-ACK corresponds to aPDSCH transmission on a secondary cell with a cell index greater thanthe first predetermined value.

Herein, processing operation (1) refers to an operation in which the CSImultiplexed with the HRQ-ACK is transmitted with the first PUCCHresource using the PUCCH format 3, processing operation (2) refers to anoperation in which the CSI multiplexed with the HARQ-ACK is transmittedwith the second PUCCH resource using the PUCCH format 4, processingoperation (3) refers to an operation in which the HARQ-ACK istransmitted with a first PUCCH resource using the PUCCH format 3 and theCSI is dropped, and processing operation (4) refers to an operation inwhich the HARQ-ACK is transmitted with a second PUCCH resource using thePUCCH format 4 and the CSI is dropped.

Also, the first PUCCH resource may be designated based on a value set inan information field included in a downlink assignment for a secondarycell with a cell index less than or equal to the first predeterminedvalue from four first PUCCH resources set by a higher layer, and thesecond PUCCH resource may be designated based on a value set in aninformation field included in a downlink assignment for a secondary cellwith a cell index greater than the first predetermined value from thefour second PUCCH resources set by the higher layer.

Also, a value designating an identical first PUCCH resource may be setfor each information field included in a plurality of downlinkassignments for a plurality of secondary cells with cell indices lessthan or equal to the first predetermined value in a particular subframe,and a value designating an identical second PUCCH resource may be setfor each information field included in a plurality of download links fora plurality of secondary cells with cell indices greater than the firstpredetermined value in a particular subframe.

In addition, the base station device 3 of the present embodiment mayinclude a transmission unit 307 configured to transmit both a first setof information used for permitting simultaneous transmission of a CSIand a HARQ-ACK using PUCCH format 3, as well as a second set ofinformation used for permitting simultaneous transmission of a CSI and aHARQ-ACK using PUCCH format 4. The base station device 3 may alsoinclude a reception unit 305 for receiving a HARQ-ACK and/or a CSI, andwherein any of the following processing operations (1) to (4) areexecuted based at least on whether the first set of information, thesecond set of information, and the HARQ-ACK correspond to a PDSCHtransmission on a secondary cell with a cell index less than or equal toa first predetermined value or whether the HARQ-ACK corresponds to aPDSCH transmission on a secondary cell with a cell index greater thanthe first predetermined value.

Herein, processing operation (1) refers to an operation in which the CSImultiplexed with the HRQ-ACK is transmitted with the first PUCCHresource using the PUCCH format 3, processing operation (2) refers to anoperation in which the CSI multiplexed with the HARQ-ACK is transmittedwith the second PUCCH resource using the PUCCH format 4, processingoperation (3) refers to an operation in which the HARQ-ACK istransmitted with a first PUCCH resource using the PUCCH format 3 and theCSI is dropped, and processing operation (4) refers to an operation inwhich the HARQ-ACK is transmitted with a second PUCCH resource using thePUCCH format 4 and the CSI is dropped.

Also, the first PUCCH resource may be designated based on a value set inan information field included in a downlink assignment for a secondarycell with a cell index less than or equal to the first predeterminedvalue from four first PUCCH resources set by a higher layer, and thesecond PUCCH resource may be designated based on a value set in aninformation field included in a downlink assignment for a secondary cellwith a cell index greater than the first predetermined value from thefour second PUCCH resources set by the higher layer.

Also, a value designating an identical first PUCCH resource may be setfor each information field included in a plurality of downlinkassignments for a plurality of secondary cells with cell indices lessthan or equal to the first predetermined value in a particular subframe,and a value designating an identical second PUCCH resource may be setfor each information field included in a plurality of download links fora plurality of secondary cells with cell indices greater than the firstpredetermined value in a particular subframe.

According to the present invention, uplink control information can beefficiently transmitted.

A program running on each of the base station device 3 and the terminaldevice 1 according to the present invention may be a program thatcontrols a central processing unit (CPU) and the like (a program forcausing a computer to operate) in such a manner as to realize thefunctions according to the above-described embodiment of the presentinvention. The information handled in these devices is temporarilystored in a random access memory (RAM) while being processed.Thereafter, the information is stored in various types of read onlymemory (ROM) such as a flash ROM and a hard disk drive (HDD) and whennecessary, is read by the CPU to be modified or rewritten.

Moreover, the terminal device 1 and the base station device 3 accordingto the above-described embodiment may be partially realized by acomputer. This configuration may be realized by recording a program forrealizing such control functions on a computer-readable recording mediumand causing a computer system to read the program recorded on therecording medium for execution.

Moreover, the “computer system” here is defined as a computer systembuilt into the terminal device 1 or the base station device 3, and thecomputer system includes an OS and hardware components such as aperipheral device. Furthermore, the “computer-readable recording medium”refers to a portable medium such as a flexible disk, a magneto-opticaldisk, a ROM, and a CD-ROM, and a storage device such as a hard diskbuilt into the computer system.

Moreover, the “computer-readable recording medium” may include a mediumthat dynamically retains the program for a short period of time, such asa communication line that is used to transmit the program over a networksuch as the Internet or over a communication line such as a telephoneline, and a medium that retains, in that case, the program for a certainperiod of time, such as a volatile memory within the computer systemwhich functions as a server or a client. Furthermore, the program mayimplement some of the functions described above, and also may be capableof implementing the functions described above in combination with aprogram already stored in the computer system.

Furthermore, the base station device 3 according to the above-describedembodiment can be realized as an aggregation (a device group)constituted of multiple devices. Devices constituting the device groupmay be each provided with some or all portions of each function or eachfunctional block of the base station device 3 according to theabove-described embodiment. It is only required that the device groupitself include general functions or general functional blocks of thebase station device 3. Furthermore, the terminal device 1 according tothe above-described embodiments can communicate with the base stationdevice as an assembly.

Furthermore, the base station device 3 according to the above-describedembodiment may be an Evolved Universal Terrestrial Radio Access Network(EUTRAN). Furthermore, the base station device 3 according to theabove-described embodiment may have some or all portions of the functionof a node higher than an eNodeB.

Furthermore, some or all portions of each of the terminal device 1 andthe base station device 3 according to the above-described embodimentmay be realized as an LSI that is a typical integrated circuit or may berealized as a chip set. The functional blocks of each of the terminaldevice 1 and the base station device 3 may be individually realized as achip, or some or all of the functional blocks may be integrated into achip. Furthermore, the circuit integration technique is not limited tothe LSI, and the integrated circuit may be implemented with a dedicatedcircuit or a general-purpose processor. Furthermore, if with advances insemiconductor technology, a circuit integration technology with which anLSI is replaced appears, it is also possible to use an integratedcircuit based on the technology.

Furthermore, according to the above-described embodiment, the terminaldevice is described as one example of a communication device, but thepresent invention is not limited to this, and can be applied to afixed-type or a stationary-type electronic apparatus installed indoorsor outdoors, for example, a terminal device or a communication device,such as an audio-video (AV) apparatus, a kitchen apparatus, a cleaningor washing machine, an air-conditioning apparatus, office equipment, avending machine, and other household apparatuses.

The embodiment of the present invention has been described in detailabove referring to the drawings, but the specific configuration is notlimited to the embodiment and includes, for example, an amendment to adesign that falls within the scope that does not depart from the gist ofthe present invention. Furthermore, various modifications are possiblewithin the scope of the present invention defined by claims, andembodiments that are made by suitably combining technical meansdisclosed according to the different embodiments are also included inthe technical scope of the present invention. Furthermore, aconfiguration in which a constituent element that achieves the sameeffect is substituted for the one that is described according to theembodiment is also included in the technical scope of the presentinvention.

INDUSTRIAL APPLICABILITY

The present invention can be applied to mobile phones, personalcomputers, tablet computers, and the like.

REFERENCE SIGNS LIST

-   1 (1A, 1B, 1C) Terminal device-   3 Base station device-   101 Higher layer processing unit-   103 Control unit-   105 Reception unit-   107 Transmission unit-   301 Higher layer processing unit-   303 Control unit-   305 Reception unit-   307 Transmission unit-   1011 Radio resource control unit-   1013 Scheduling information interpretation unit-   1015 Transmit power control unit-   3011 Radio resource control unit-   3013 Scheduling unit-   3015 Transmit power control unit

1-16. (canceled)
 17. A terminal device which communicates with a basestation device using serving cells including a primary cell and asecondary cell, the terminal device comprising: receiving circuitryconfigured to receive a radio resource control (RRC) message; andtransmitting circuitry configured to transmit hybrid automatic repeatrequest-acknowledgment (HARQ-ACK) for a physical downlink shared channel(PDSCH) transmission on the secondary cell, the PDSCH transmission onthe secondary cell being indicated by a detection of a physical downlinkcontrol channel (PDCCH), wherein for the transmission of the HARQ-ACKfor the PDSCH transmission on the secondary cell, the transmittingcircuitry is configured to perform any one of a first behavior and asecond behavior based on information included in the RRC message, thefirst behavior is a behavior which performs any one of the transmissionof the HARQ-ACK using a first physical uplink control channel (PUCCH)format and the transmission of the HARQ-ACK using a second PUCCH format,and the second behavior is a behavior which performs the transmissionthe HARQ-ACK always using the second PUCCH format.
 18. The terminaldevice according to claim 17, wherein the any one of the transmission ofthe HARQ-ACK using the first PUCCH format and the transmission of theHARQ-ACK using the second PUCCH format is performed based on a number ofbits of the HARQ-ACK, the number of bits of the HARQ-ACK being given byserving cell(s) on which PDSCH(s) is scheduled.
 19. The terminal deviceaccording to claim 17, wherein the HARQ-ACK includes informationindicating a positive acknowledgment or a negative acknowledgment.
 20. Abase station device which communicates with a terminal device usingserving cells including a primary cell and a secondary cell, the basestation device comprising: transmitting circuitry configured to transmita radio resource control (RRC) message; and receiving circuitryconfigured to receive hybrid automatic repeat request-acknowledgment(HARQ-ACK) for a physical downlink shared channel (PDSCH) transmissionon the secondary cell, the PDSCH transmission on the secondary cellbeing scheduled by using a physical downlink control channel (PDCCH),wherein for the reception of the HARQ-ACK for the PDSCH transmission onthe secondary cell, the receiving circuitry is configured to perform anyone of a first behavior and a second behavior based on informationincluded in the RRC message, the first behavior is a behavior whichperforms any one of the reception of the HARQ-ACK using a first physicaluplink control channel (PUCCH) format and the reception of the HARQ-ACKusing a second PUCCH format, and the second behavior is a behavior whichperforms the reception the HARQ-ACK always using the second PUCCHformat.
 21. The base station device according to claim 20, wherein theany one of the reception of the HARQ-ACK using the first PUCCH formatand the reception of the HARQ-ACK using the second PUCCH format isperformed based on a number of bits of the HARQ-ACK, the number of bitsof the HARQ-ACK being given by serving cell(s) on which PDSCH(s) isscheduled.
 22. The base station device according to claim 20, whereinthe HARQ-ACK includes information indicating a positive acknowledgmentor a negative acknowledgment.
 23. A communication method of a terminaldevice which communicates with a base station device using serving cellsincluding a primary cell and a secondary cell, the communication methodcomprising: receiving a radio resource control (RRC) message; andtransmitting hybrid automatic repeat request-acknowledgment (HARQ-ACK)for a physical downlink shared channel (PDSCH) transmission on thesecondary cell, the PDSCH transmission on the secondary cell beingindicated by a detection of a physical downlink control channel (PDCCH),wherein for the transmission of the HARQ-ACK for the PDSCH transmissionon the secondary cell, the transmitting circuitry is configured toperform any one of a first behavior and a second behavior based oninformation included in the RRC message, the first behavior is abehavior which performs any one of the transmission of the HARQ-ACKusing a first physical uplink control channel (PUCCH) format and thetransmission of the HARQ-ACK using a second PUCCH format, and the secondbehavior is a behavior which performs the transmission the HARQ-ACKalways using the second PUCCH format.
 24. The communication methodaccording to claim 23, wherein the any one of the transmission of theHARQ-ACK using the first PUCCH format and the transmission of theHARQ-ACK using the second PUCCH format is performed based on a number ofbits of the HARQ-ACK, the number of bits of the HARQ-ACK being given byserving cell(s) on which PDSCH(s) is scheduled.
 25. The communicationmethod according to claim 23, wherein the HARQ-ACK includes informationindicating a positive acknowledgment or a negative acknowledgment.
 26. Acommunication method of a base station device which communicates with aterminal device using serving cells including a primary cell and asecondary cell, the communication method comprising: transmitting aradio resource control (RRC) message; and receiving hybrid automaticrepeat request-acknowledgment (HARQ-ACK) for a physical downlink sharedchannel (PDSCH) transmission on the secondary cell, the PDSCHtransmission on the secondary cell being scheduled by using a physicaldownlink control channel (PDCCH), wherein for the reception of theHARQ-ACK for the PDSCH transmission on the secondary cell, the receivingcircuitry is configured to perform any one of a first behavior and asecond behavior based on information included in the RRC message, thefirst behavior is a behavior which performs any one of the reception ofthe HARQ-ACK using a first physical uplink control channel (PUCCH)format and the reception of the HARQ-ACK using a second PUCCH format,and the second behavior is a behavior which performs the reception theHARQ-ACK always using the second PUCCH format.
 27. The communicationmethod according to claim 26, wherein the any one of the reception ofthe HARQ-ACK using the first PUCCH format and the reception of theHARQ-ACK using the second PUCCH format is performed based on a number ofbits of the HARQ-ACK, the number of bits of the HARQ-ACK being given byserving cell(s) on which PDSCH(s) is scheduled.
 28. The communicationmethod according to claim 26, wherein the HARQ-ACK includes informationindicating a positive acknowledgment or a negative acknowledgment.